640340

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{317}}^1$

素因数の和:427

約数の個数: 24

約数和(自身を含む): 1362312

約数和(自身を除く): 721972

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 317, 404, 505, 634, 1010, 1268, 1585, 2020, 3170, 6340, 32017, 64034, 128068, 160085, 320170, 640340]

約数ペア:

[(1, 640340), (2, 320170), (4, 160085), (5, 128068), (10, 64034), (20, 32017), (101, 6340), (202, 3170), (317, 2020), (404, 1585), (505, 1268), (634, 1010)]