21556760

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{83}}^1\times {\mathrm{151}}^1$

素因数の和:288

約数の個数: 64

約数和(自身を含む): 50561280

約数和(自身を除く): 29004520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 83, 86, 151, 166, 172, 215, 302, 332, 344, 415, 430, 604, 664, 755, 830, 860, 1208, 1510, 1660, 1720, 3020, 3320, 3569, 6040, 6493, 7138, 12533, 12986, 14276, 17845, 25066, 25972, 28552, 32465, 35690, 50132, 51944, 62665, 64930, 71380, 100264, 125330, 129860, 142760, 250660, 259720, 501320, 538919, 1077838, 2155676, 2694595, 4311352, 5389190, 10778380, 21556760]

約数ペア:

[(1, 21556760), (2, 10778380), (4, 5389190), (5, 4311352), (8, 2694595), (10, 2155676), (20, 1077838), (40, 538919), (43, 501320), (83, 259720), (86, 250660), (151, 142760), (166, 129860), (172, 125330), (215, 100264), (302, 71380), (332, 64930), (344, 62665), (415, 51944), (430, 50132), (604, 35690), (664, 32465), (755, 28552), (830, 25972), (860, 25066), (1208, 17845), (1510, 14276), (1660, 12986), (1720, 12533), (3020, 7138), (3320, 6493), (3569, 6040)]