21206380

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81563}}^1$

素因数の和:81585

約数の個数: 24

約数和(自身を含む): 47959632

約数和(自身を除く): 26753252

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81563, 163126, 326252, 407815, 815630, 1060319, 1631260, 2120638, 4241276, 5301595, 10603190, 21206380]

約数ペア:

[(1, 21206380), (2, 10603190), (4, 5301595), (5, 4241276), (10, 2120638), (13, 1631260), (20, 1060319), (26, 815630), (52, 407815), (65, 326252), (130, 163126), (260, 81563)]