20974980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{26891}}^1$

素因数の和:26916

約数の個数: 48

約数和(自身を含む): 63249984

約数和(自身を除く): 42275004

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 26891, 53782, 80673, 107564, 134455, 161346, 268910, 322692, 349583, 403365, 537820, 699166, 806730, 1048749, 1398332, 1613460, 1747915, 2097498, 3495830, 4194996, 5243745, 6991660, 10487490, 20974980]

約数ペア:

[(1, 20974980), (2, 10487490), (3, 6991660), (4, 5243745), (5, 4194996), (6, 3495830), (10, 2097498), (12, 1747915), (13, 1613460), (15, 1398332), (20, 1048749), (26, 806730), (30, 699166), (39, 537820), (52, 403365), (60, 349583), (65, 322692), (78, 268910), (130, 161346), (156, 134455), (195, 107564), (260, 80673), (390, 53782), (780, 26891)]