21512820

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{131}}^1$

素因数の和:190

約数の個数: 192

約数和(自身を含む): 76640256

約数和(自身を除く): 55127436

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 17, 20, 21, 23, 28, 30, 34, 35, 42, 46, 51, 60, 68, 69, 70, 84, 85, 92, 102, 105, 115, 119, 131, 138, 140, 161, 170, 204, 210, 230, 238, 255, 262, 276, 322, 340, 345, 357, 391, 393, 420, 460, 476, 483, 510, 524, 595, 644, 655, 690, 714, 782, 786, 805, 917, 966, 1020, 1173, 1190, 1310, 1380, 1428, 1564, 1572, 1610, 1785, 1834, 1932, 1955, 1965, 2227, 2346, 2380, 2415, 2620, 2737, 2751, 3013, 3220, 3570, 3668, 3910, 3930, 4454, 4585, 4692, 4830, 5474, 5502, 5865, 6026, 6681, 7140, 7820, 7860, 8211, 8908, 9039, 9170, 9660, 10948, 11004, 11135, 11730, 12052, 13362, 13685, 13755, 15065, 15589, 16422, 18078, 18340, 21091, 22270, 23460, 26724, 27370, 27510, 30130, 31178, 32844, 33405, 36156, 41055, 42182, 44540, 45195, 46767, 51221, 54740, 55020, 60260, 62356, 63273, 66810, 77945, 82110, 84364, 90390, 93534, 102442, 105455, 126546, 133620, 153663, 155890, 164220, 180780, 187068, 204884, 210910, 233835, 253092, 256105, 307326, 311780, 316365, 358547, 421820, 467670, 512210, 614652, 632730, 717094, 768315, 935340, 1024420, 1075641, 1265460, 1434188, 1536630, 1792735, 2151282, 3073260, 3585470, 4302564, 5378205, 7170940, 10756410, 21512820]

約数ペア:

[(1, 21512820), (2, 10756410), (3, 7170940), (4, 5378205), (5, 4302564), (6, 3585470), (7, 3073260), (10, 2151282), (12, 1792735), (14, 1536630), (15, 1434188), (17, 1265460), (20, 1075641), (21, 1024420), (23, 935340), (28, 768315), (30, 717094), (34, 632730), (35, 614652), (42, 512210), (46, 467670), (51, 421820), (60, 358547), (68, 316365), (69, 311780), (70, 307326), (84, 256105), (85, 253092), (92, 233835), (102, 210910), (105, 204884), (115, 187068), (119, 180780), (131, 164220), (138, 155890), (140, 153663), (161, 133620), (170, 126546), (204, 105455), (210, 102442), (230, 93534), (238, 90390), (255, 84364), (262, 82110), (276, 77945), (322, 66810), (340, 63273), (345, 62356), (357, 60260), (391, 55020), (393, 54740), (420, 51221), (460, 46767), (476, 45195), (483, 44540), (510, 42182), (524, 41055), (595, 36156), (644, 33405), (655, 32844), (690, 31178), (714, 30130), (782, 27510), (786, 27370), (805, 26724), (917, 23460), (966, 22270), (1020, 21091), (1173, 18340), (1190, 18078), (1310, 16422), (1380, 15589), (1428, 15065), (1564, 13755), (1572, 13685), (1610, 13362), (1785, 12052), (1834, 11730), (1932, 11135), (1955, 11004), (1965, 10948), (2227, 9660), (2346, 9170), (2380, 9039), (2415, 8908), (2620, 8211), (2737, 7860), (2751, 7820), (3013, 7140), (3220, 6681), (3570, 6026), (3668, 5865), (3910, 5502), (3930, 5474), (4454, 4830), (4585, 4692)]