20771920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19973}}^1$

素因数の和:19999

約数の個数: 40

約数和(自身を含む): 52012296

約数和(自身を除く): 31240376

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19973, 39946, 79892, 99865, 159784, 199730, 259649, 319568, 399460, 519298, 798920, 1038596, 1298245, 1597840, 2077192, 2596490, 4154384, 5192980, 10385960, 20771920]

約数ペア:

[(1, 20771920), (2, 10385960), (4, 5192980), (5, 4154384), (8, 2596490), (10, 2077192), (13, 1597840), (16, 1298245), (20, 1038596), (26, 798920), (40, 519298), (52, 399460), (65, 319568), (80, 259649), (104, 199730), (130, 159784), (208, 99865), (260, 79892), (520, 39946), (1040, 19973)]