21739240

素因数分解:

$2^3\times 5^1\times {\mathrm{101}}^1\times {\mathrm{5381}}^1$

素因数の和:5493

約数の個数: 32

約数和(自身を含む): 49406760

約数和(自身を除く): 27667520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 101, 202, 404, 505, 808, 1010, 2020, 4040, 5381, 10762, 21524, 26905, 43048, 53810, 107620, 215240, 543481, 1086962, 2173924, 2717405, 4347848, 5434810, 10869620, 21739240]

約数ペア:

[(1, 21739240), (2, 10869620), (4, 5434810), (5, 4347848), (8, 2717405), (10, 2173924), (20, 1086962), (40, 543481), (101, 215240), (202, 107620), (404, 53810), (505, 43048), (808, 26905), (1010, 21524), (2020, 10762), (4040, 5381)]