21440420

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{4271}}^1$

素因数の和:4531

約数の個数: 24

約数和(自身を含む): 45214848

約数和(自身を除く): 23774428

約数列:

[1, 2, 4, 5, 10, 20, 251, 502, 1004, 1255, 2510, 4271, 5020, 8542, 17084, 21355, 42710, 85420, 1072021, 2144042, 4288084, 5360105, 10720210, 21440420]

約数ペア:

[(1, 21440420), (2, 10720210), (4, 5360105), (5, 4288084), (10, 2144042), (20, 1072021), (251, 85420), (502, 42710), (1004, 21355), (1255, 17084), (2510, 8542), (4271, 5020)]