21820815

素因数分解:

$3^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{11827}}^1$

素因数の和:11879

約数の個数: 24

約数和(自身を含む): 38748528

約数和(自身を除く): 16927713

約数列:

[1, 3, 5, 9, 15, 41, 45, 123, 205, 369, 615, 1845, 11827, 35481, 59135, 106443, 177405, 484907, 532215, 1454721, 2424535, 4364163, 7273605, 21820815]

約数ペア:

[(1, 21820815), (3, 7273605), (5, 4364163), (9, 2424535), (15, 1454721), (41, 532215), (45, 484907), (123, 177405), (205, 106443), (369, 59135), (615, 35481), (1845, 11827)]