81557320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{156841}}^1$

素因数の和:156865

約数の個数: 32

約数和(自身を含む): 197620920

約数和(自身を除く): 116063600

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 156841, 313682, 627364, 784205, 1254728, 1568410, 2038933, 3136820, 4077866, 6273640, 8155732, 10194665, 16311464, 20389330, 40778660, 81557320]

約数ペア:

[(1, 81557320), (2, 40778660), (4, 20389330), (5, 16311464), (8, 10194665), (10, 8155732), (13, 6273640), (20, 4077866), (26, 3136820), (40, 2038933), (52, 1568410), (65, 1254728), (104, 784205), (130, 627364), (260, 313682), (520, 156841)]