20447440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19661}}^1$

素因数の和:19687

約数の個数: 40

約数和(自身を含む): 51199848

約数和(自身を除く): 30752408

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19661, 39322, 78644, 98305, 157288, 196610, 255593, 314576, 393220, 511186, 786440, 1022372, 1277965, 1572880, 2044744, 2555930, 4089488, 5111860, 10223720, 20447440]

約数ペア:

[(1, 20447440), (2, 10223720), (4, 5111860), (5, 4089488), (8, 2555930), (10, 2044744), (13, 1572880), (16, 1277965), (20, 1022372), (26, 786440), (40, 511186), (52, 393220), (65, 314576), (80, 255593), (104, 196610), (130, 157288), (208, 98305), (260, 78644), (520, 39322), (1040, 19661)]