81791320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157291}}^1$

素因数の和:157315

約数の個数: 32

約数和(自身を含む): 198187920

約数和(自身を除く): 116396600

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 157291, 314582, 629164, 786455, 1258328, 1572910, 2044783, 3145820, 4089566, 6291640, 8179132, 10223915, 16358264, 20447830, 40895660, 81791320]

約数ペア:

[(1, 81791320), (2, 40895660), (4, 20447830), (5, 16358264), (8, 10223915), (10, 8179132), (13, 6291640), (20, 4089566), (26, 3145820), (40, 2044783), (52, 1572910), (65, 1258328), (104, 786455), (130, 629164), (260, 314582), (520, 157291)]