20989510

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{163}}^2$

素因数の和:412

約数の個数: 24

約数和(自身を含む): 38495520

約数和(自身を除く): 17506010

約数列:

[1, 2, 5, 10, 79, 158, 163, 326, 395, 790, 815, 1630, 12877, 25754, 26569, 53138, 64385, 128770, 132845, 265690, 2098951, 4197902, 10494755, 20989510]

約数ペア:

[(1, 20989510), (2, 10494755), (5, 4197902), (10, 2098951), (79, 265690), (158, 132845), (163, 128770), (326, 64385), (395, 53138), (790, 26569), (815, 25754), (1630, 12877)]