20815880

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{16787}}^1$

素因数の和:16829

約数の個数: 32

約数和(自身を含む): 48349440

約数和(自身を除く): 27533560

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 16787, 33574, 67148, 83935, 134296, 167870, 335740, 520397, 671480, 1040794, 2081588, 2601985, 4163176, 5203970, 10407940, 20815880]

約数ペア:

[(1, 20815880), (2, 10407940), (4, 5203970), (5, 4163176), (8, 2601985), (10, 2081588), (20, 1040794), (31, 671480), (40, 520397), (62, 335740), (124, 167870), (155, 134296), (248, 83935), (310, 67148), (620, 33574), (1240, 16787)]