21795640

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4999}}^1$

素因数の和:5119

約数の個数: 32

約数和(自身を含む): 49500000

約数和(自身を除く): 27704360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4999, 9998, 19996, 24995, 39992, 49990, 99980, 199960, 544891, 1089782, 2179564, 2724455, 4359128, 5448910, 10897820, 21795640]

約数ペア:

[(1, 21795640), (2, 10897820), (4, 5448910), (5, 4359128), (8, 2724455), (10, 2179564), (20, 1089782), (40, 544891), (109, 199960), (218, 99980), (436, 49990), (545, 39992), (872, 24995), (1090, 19996), (2180, 9998), (4360, 4999)]