21220940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81619}}^1$

素因数の和:81641

約数の個数: 24

約数和(自身を含む): 47992560

約数和(自身を除く): 26771620

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81619, 163238, 326476, 408095, 816190, 1061047, 1632380, 2122094, 4244188, 5305235, 10610470, 21220940]

約数ペア:

[(1, 21220940), (2, 10610470), (4, 5305235), (5, 4244188), (10, 2122094), (13, 1632380), (20, 1061047), (26, 816190), (52, 408095), (65, 326476), (130, 163238), (260, 81619)]