21618680

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12569}}^1$

素因数の和:12623

約数の個数: 32

約数和(自身を含む): 49777200

約数和(自身を除く): 28158520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12569, 25138, 50276, 62845, 100552, 125690, 251380, 502760, 540467, 1080934, 2161868, 2702335, 4323736, 5404670, 10809340, 21618680]

約数ペア:

[(1, 21618680), (2, 10809340), (4, 5404670), (5, 4323736), (8, 2702335), (10, 2161868), (20, 1080934), (40, 540467), (43, 502760), (86, 251380), (172, 125690), (215, 100552), (344, 62845), (430, 50276), (860, 25138), (1720, 12569)]