20715980

素因数分解:

$2^2\times 5^1\times {\mathrm{211}}^1\times {\mathrm{4909}}^1$

素因数の和:5129

約数の個数: 24

約数和(自身を含む): 43718640

約数和(自身を除く): 23002660

約数列:

[1, 2, 4, 5, 10, 20, 211, 422, 844, 1055, 2110, 4220, 4909, 9818, 19636, 24545, 49090, 98180, 1035799, 2071598, 4143196, 5178995, 10357990, 20715980]

約数ペア:

[(1, 20715980), (2, 10357990), (4, 5178995), (5, 4143196), (10, 2071598), (20, 1035799), (211, 98180), (422, 49090), (844, 24545), (1055, 19636), (2110, 9818), (4220, 4909)]