21187220

素因数分解:

$2^2\times 5^1\times {\mathrm{971}}^1\times {\mathrm{1091}}^1$

素因数の和:2071

約数の個数: 24

約数和(自身を含む): 44579808

約数和(自身を除く): 23392588

約数列:

[1, 2, 4, 5, 10, 20, 971, 1091, 1942, 2182, 3884, 4364, 4855, 5455, 9710, 10910, 19420, 21820, 1059361, 2118722, 4237444, 5296805, 10593610, 21187220]

約数ペア:

[(1, 21187220), (2, 10593610), (4, 5296805), (5, 4237444), (10, 2118722), (20, 1059361), (971, 21820), (1091, 19420), (1942, 10910), (2182, 9710), (3884, 5455), (4364, 4855)]