21198580

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81533}}^1$

素因数の和:81555

約数の個数: 24

約数和(自身を含む): 47941992

約数和(自身を除く): 26743412

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81533, 163066, 326132, 407665, 815330, 1059929, 1630660, 2119858, 4239716, 5299645, 10599290, 21198580]

約数ペア:

[(1, 21198580), (2, 10599290), (4, 5299645), (5, 4239716), (10, 2119858), (13, 1630660), (20, 1059929), (26, 815330), (52, 407665), (65, 326132), (130, 163066), (260, 81533)]