20661680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19867}}^1$

素因数の和:19893

約数の個数: 40

約数和(自身を含む): 51736272

約数和(自身を除く): 31074592

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19867, 39734, 79468, 99335, 158936, 198670, 258271, 317872, 397340, 516542, 794680, 1033084, 1291355, 1589360, 2066168, 2582710, 4132336, 5165420, 10330840, 20661680]

約数ペア:

[(1, 20661680), (2, 10330840), (4, 5165420), (5, 4132336), (8, 2582710), (10, 2066168), (13, 1589360), (16, 1291355), (20, 1033084), (26, 794680), (40, 516542), (52, 397340), (65, 317872), (80, 258271), (104, 198670), (130, 158936), (208, 99335), (260, 79468), (520, 39734), (1040, 19867)]