21145780

素因数分解:

$2^2\times 5^1\times {\mathrm{743}}^1\times {\mathrm{1423}}^1$

素因数の和:2175

約数の個数: 24

約数和(自身を含む): 44497152

約数和(自身を除く): 23351372

約数列:

[1, 2, 4, 5, 10, 20, 743, 1423, 1486, 2846, 2972, 3715, 5692, 7115, 7430, 14230, 14860, 28460, 1057289, 2114578, 4229156, 5286445, 10572890, 21145780]

約数ペア:

[(1, 21145780), (2, 10572890), (4, 5286445), (5, 4229156), (10, 2114578), (20, 1057289), (743, 28460), (1423, 14860), (1486, 14230), (2846, 7430), (2972, 7115), (3715, 5692)]