21194420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81517}}^1$

素因数の和:81539

約数の個数: 24

約数和(自身を含む): 47932584

約数和(自身を除く): 26738164

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81517, 163034, 326068, 407585, 815170, 1059721, 1630340, 2119442, 4238884, 5298605, 10597210, 21194420]

約数ペア:

[(1, 21194420), (2, 10597210), (4, 5298605), (5, 4238884), (10, 2119442), (13, 1630340), (20, 1059721), (26, 815170), (52, 407585), (65, 326068), (130, 163034), (260, 81517)]