21559640

素因数分解:

$2^3\times 5^1\times {\mathrm{223}}^1\times {\mathrm{2417}}^1$

素因数の和:2651

約数の個数: 32

約数和(自身を含む): 48746880

約数和(自身を除く): 27187240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 223, 446, 892, 1115, 1784, 2230, 2417, 4460, 4834, 8920, 9668, 12085, 19336, 24170, 48340, 96680, 538991, 1077982, 2155964, 2694955, 4311928, 5389910, 10779820, 21559640]

約数ペア:

[(1, 21559640), (2, 10779820), (4, 5389910), (5, 4311928), (8, 2694955), (10, 2155964), (20, 1077982), (40, 538991), (223, 96680), (446, 48340), (892, 24170), (1115, 19336), (1784, 12085), (2230, 9668), (2417, 8920), (4460, 4834)]