20918475

素因数分解:

$3^2\times 5^2\times {\mathrm{239}}^1\times {\mathrm{389}}^1$

素因数の和:644

約数の個数: 36

約数和(自身を含む): 37720800

約数和(自身を除く): 16802325

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 225, 239, 389, 717, 1167, 1195, 1945, 2151, 3501, 3585, 5835, 5975, 9725, 10755, 17505, 17925, 29175, 53775, 87525, 92971, 278913, 464855, 836739, 1394565, 2324275, 4183695, 6972825, 20918475]

約数ペア:

[(1, 20918475), (3, 6972825), (5, 4183695), (9, 2324275), (15, 1394565), (25, 836739), (45, 464855), (75, 278913), (225, 92971), (239, 87525), (389, 53775), (717, 29175), (1167, 17925), (1195, 17505), (1945, 10755), (2151, 9725), (3501, 5975), (3585, 5835)]