21019240

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1$

素因数の和:143

約数の個数: 128

約数和(自身を含む): 56401920

約数和(自身を除く): 35382680

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 23, 31, 40, 44, 46, 55, 62, 67, 88, 92, 110, 115, 124, 134, 155, 184, 220, 230, 248, 253, 268, 310, 335, 341, 440, 460, 506, 536, 620, 670, 682, 713, 737, 920, 1012, 1240, 1265, 1340, 1364, 1426, 1474, 1541, 1705, 2024, 2077, 2530, 2680, 2728, 2852, 2948, 3082, 3410, 3565, 3685, 4154, 5060, 5704, 5896, 6164, 6820, 7130, 7370, 7705, 7843, 8308, 10120, 10385, 12328, 13640, 14260, 14740, 15410, 15686, 16616, 16951, 20770, 22847, 28520, 29480, 30820, 31372, 33902, 39215, 41540, 45694, 47771, 61640, 62744, 67804, 78430, 83080, 84755, 91388, 95542, 114235, 135608, 156860, 169510, 182776, 191084, 228470, 238855, 313720, 339020, 382168, 456940, 477710, 525481, 678040, 913880, 955420, 1050962, 1910840, 2101924, 2627405, 4203848, 5254810, 10509620, 21019240]

約数ペア:

[(1, 21019240), (2, 10509620), (4, 5254810), (5, 4203848), (8, 2627405), (10, 2101924), (11, 1910840), (20, 1050962), (22, 955420), (23, 913880), (31, 678040), (40, 525481), (44, 477710), (46, 456940), (55, 382168), (62, 339020), (67, 313720), (88, 238855), (92, 228470), (110, 191084), (115, 182776), (124, 169510), (134, 156860), (155, 135608), (184, 114235), (220, 95542), (230, 91388), (248, 84755), (253, 83080), (268, 78430), (310, 67804), (335, 62744), (341, 61640), (440, 47771), (460, 45694), (506, 41540), (536, 39215), (620, 33902), (670, 31372), (682, 30820), (713, 29480), (737, 28520), (920, 22847), (1012, 20770), (1240, 16951), (1265, 16616), (1340, 15686), (1364, 15410), (1426, 14740), (1474, 14260), (1541, 13640), (1705, 12328), (2024, 10385), (2077, 10120), (2530, 8308), (2680, 7843), (2728, 7705), (2852, 7370), (2948, 7130), (3082, 6820), (3410, 6164), (3565, 5896), (3685, 5704), (4154, 5060)]