21281780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81853}}^1$

素因数の和:81875

約数の個数: 24

約数和(自身を含む): 48130152

約数和(自身を除く): 26848372

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81853, 163706, 327412, 409265, 818530, 1064089, 1637060, 2128178, 4256356, 5320445, 10640890, 21281780]

約数ペア:

[(1, 21281780), (2, 10640890), (4, 5320445), (5, 4256356), (10, 2128178), (13, 1637060), (20, 1064089), (26, 818530), (52, 409265), (65, 327412), (130, 163706), (260, 81853)]