639825640

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{146749}}^1$

素因数の和:146869

約数の個数: 32

約数和(自身を含む): 1452825000

約数和(自身を除く): 812999360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 146749, 293498, 586996, 733745, 1173992, 1467490, 2934980, 5869960, 15995641, 31991282, 63982564, 79978205, 127965128, 159956410, 319912820, 639825640]

約数ペア:

[(1, 639825640), (2, 319912820), (4, 159956410), (5, 127965128), (8, 79978205), (10, 63982564), (20, 31991282), (40, 15995641), (109, 5869960), (218, 2934980), (436, 1467490), (545, 1173992), (872, 733745), (1090, 586996), (2180, 293498), (4360, 146749)]