21290220

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{277}}^1$

素因数の和:360

約数の個数: 144

約数和(自身を含む): 75286848

約数和(自身を除く): 53996628

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 61, 63, 70, 84, 90, 105, 122, 126, 140, 180, 183, 210, 244, 252, 277, 305, 315, 366, 420, 427, 549, 554, 610, 630, 732, 831, 854, 915, 1098, 1108, 1220, 1260, 1281, 1385, 1662, 1708, 1830, 1939, 2135, 2196, 2493, 2562, 2745, 2770, 3324, 3660, 3843, 3878, 4155, 4270, 4986, 5124, 5490, 5540, 5817, 6405, 7686, 7756, 8310, 8540, 9695, 9972, 10980, 11634, 12465, 12810, 15372, 16620, 16897, 17451, 19215, 19390, 23268, 24930, 25620, 29085, 33794, 34902, 38430, 38780, 49860, 50691, 58170, 67588, 69804, 76860, 84485, 87255, 101382, 116340, 118279, 152073, 168970, 174510, 202764, 236558, 253455, 304146, 337940, 349020, 354837, 473116, 506910, 591395, 608292, 709674, 760365, 1013820, 1064511, 1182790, 1419348, 1520730, 1774185, 2129022, 2365580, 3041460, 3548370, 4258044, 5322555, 7096740, 10645110, 21290220]

約数ペア:

[(1, 21290220), (2, 10645110), (3, 7096740), (4, 5322555), (5, 4258044), (6, 3548370), (7, 3041460), (9, 2365580), (10, 2129022), (12, 1774185), (14, 1520730), (15, 1419348), (18, 1182790), (20, 1064511), (21, 1013820), (28, 760365), (30, 709674), (35, 608292), (36, 591395), (42, 506910), (45, 473116), (60, 354837), (61, 349020), (63, 337940), (70, 304146), (84, 253455), (90, 236558), (105, 202764), (122, 174510), (126, 168970), (140, 152073), (180, 118279), (183, 116340), (210, 101382), (244, 87255), (252, 84485), (277, 76860), (305, 69804), (315, 67588), (366, 58170), (420, 50691), (427, 49860), (549, 38780), (554, 38430), (610, 34902), (630, 33794), (732, 29085), (831, 25620), (854, 24930), (915, 23268), (1098, 19390), (1108, 19215), (1220, 17451), (1260, 16897), (1281, 16620), (1385, 15372), (1662, 12810), (1708, 12465), (1830, 11634), (1939, 10980), (2135, 9972), (2196, 9695), (2493, 8540), (2562, 8310), (2745, 7756), (2770, 7686), (3324, 6405), (3660, 5817), (3843, 5540), (3878, 5490), (4155, 5124), (4270, 4986)]