81720080

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78577}}^1$

素因数の和:78603

約数の個数: 40

約数和(自身を含む): 204617112

約数和(自身を除く): 122897032

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78577, 157154, 314308, 392885, 628616, 785770, 1021501, 1257232, 1571540, 2043002, 3143080, 4086004, 5107505, 6286160, 8172008, 10215010, 16344016, 20430020, 40860040, 81720080]

約数ペア:

[(1, 81720080), (2, 40860040), (4, 20430020), (5, 16344016), (8, 10215010), (10, 8172008), (13, 6286160), (16, 5107505), (20, 4086004), (26, 3143080), (40, 2043002), (52, 1571540), (65, 1257232), (80, 1021501), (104, 785770), (130, 628616), (208, 392885), (260, 314308), (520, 157154), (1040, 78577)]