21264220

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7649}}^1$

素因数の和:7797

約数の個数: 24

約数和(自身を含む): 44982000

約数和(自身を除く): 23717780

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7649, 15298, 30596, 38245, 76490, 152980, 1063211, 2126422, 4252844, 5316055, 10632110, 21264220]

約数ペア:

[(1, 21264220), (2, 10632110), (4, 5316055), (5, 4252844), (10, 2126422), (20, 1063211), (139, 152980), (278, 76490), (556, 38245), (695, 30596), (1390, 15298), (2780, 7649)]