21182780

素因数分解:

$2^2\times 5^1\times {\mathrm{647}}^1\times {\mathrm{1637}}^1$

素因数の和:2293

約数の個数: 24

約数和(自身を含む): 44579808

約数和(自身を除く): 23397028

約数列:

[1, 2, 4, 5, 10, 20, 647, 1294, 1637, 2588, 3235, 3274, 6470, 6548, 8185, 12940, 16370, 32740, 1059139, 2118278, 4236556, 5295695, 10591390, 21182780]

約数ペア:

[(1, 21182780), (2, 10591390), (4, 5295695), (5, 4236556), (10, 2118278), (20, 1059139), (647, 32740), (1294, 16370), (1637, 12940), (2588, 8185), (3235, 6548), (3274, 6470)]