21080205

素因数分解:

$3^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{9967}}^1$

素因数の和:10025

約数の個数: 24

約数和(自身を含む): 37320192

約数和(自身を除く): 16239987

約数列:

[1, 3, 5, 9, 15, 45, 47, 141, 235, 423, 705, 2115, 9967, 29901, 49835, 89703, 149505, 448515, 468449, 1405347, 2342245, 4216041, 7026735, 21080205]

約数ペア:

[(1, 21080205), (3, 7026735), (5, 4216041), (9, 2342245), (15, 1405347), (45, 468449), (47, 448515), (141, 149505), (235, 89703), (423, 49835), (705, 29901), (2115, 9967)]