21207940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81569}}^1$

素因数の和:81591

約数の個数: 24

約数和(自身を含む): 47963160

約数和(自身を除く): 26755220

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81569, 163138, 326276, 407845, 815690, 1060397, 1631380, 2120794, 4241588, 5301985, 10603970, 21207940]

約数ペア:

[(1, 21207940), (2, 10603970), (4, 5301985), (5, 4241588), (10, 2120794), (13, 1631380), (20, 1060397), (26, 815690), (52, 407845), (65, 326276), (130, 163138), (260, 81569)]