20640020

素因数分解:

$2^2\times 5^1\times {\mathrm{67}}^1\times {\mathrm{73}}^1\times {\mathrm{211}}^1$

素因数の和:360

約数の個数: 48

約数和(自身を含む): 44804928

約数和(自身を除く): 24164908

約数列:

[1, 2, 4, 5, 10, 20, 67, 73, 134, 146, 211, 268, 292, 335, 365, 422, 670, 730, 844, 1055, 1340, 1460, 2110, 4220, 4891, 9782, 14137, 15403, 19564, 24455, 28274, 30806, 48910, 56548, 61612, 70685, 77015, 97820, 141370, 154030, 282740, 308060, 1032001, 2064002, 4128004, 5160005, 10320010, 20640020]

約数ペア:

[(1, 20640020), (2, 10320010), (4, 5160005), (5, 4128004), (10, 2064002), (20, 1032001), (67, 308060), (73, 282740), (134, 154030), (146, 141370), (211, 97820), (268, 77015), (292, 70685), (335, 61612), (365, 56548), (422, 48910), (670, 30806), (730, 28274), (844, 24455), (1055, 19564), (1340, 15403), (1460, 14137), (2110, 9782), (4220, 4891)]