646220

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{409}}^1$

素因数の和:497

約数の個数: 24

約数和(自身を含む): 1377600

約数和(自身を除く): 731380

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 409, 790, 818, 1580, 1636, 2045, 4090, 8180, 32311, 64622, 129244, 161555, 323110, 646220]

約数ペア:

[(1, 646220), (2, 323110), (4, 161555), (5, 129244), (10, 64622), (20, 32311), (79, 8180), (158, 4090), (316, 2045), (395, 1636), (409, 1580), (790, 818)]