21125980

素因数分解:

$2^2\times 5^1\times {\mathrm{419}}^1\times {\mathrm{2521}}^1$

素因数の和:2949

約数の個数: 24

約数和(自身を含む): 44488080

約数和(自身を除く): 23362100

約数列:

[1, 2, 4, 5, 10, 20, 419, 838, 1676, 2095, 2521, 4190, 5042, 8380, 10084, 12605, 25210, 50420, 1056299, 2112598, 4225196, 5281495, 10562990, 21125980]

約数ペア:

[(1, 21125980), (2, 10562990), (4, 5281495), (5, 4225196), (10, 2112598), (20, 1056299), (419, 50420), (838, 25210), (1676, 12605), (2095, 10084), (2521, 8380), (4190, 5042)]