21181815

素因数分解:

$3^2\times 5^1\times {\mathrm{383}}^1\times {\mathrm{1229}}^1$

素因数の和:1623

約数の個数: 24

約数和(自身を含む): 36840960

約数和(自身を除く): 15659145

約数列:

[1, 3, 5, 9, 15, 45, 383, 1149, 1229, 1915, 3447, 3687, 5745, 6145, 11061, 17235, 18435, 55305, 470707, 1412121, 2353535, 4236363, 7060605, 21181815]

約数ペア:

[(1, 21181815), (3, 7060605), (5, 4236363), (9, 2353535), (15, 1412121), (45, 470707), (383, 55305), (1149, 18435), (1229, 17235), (1915, 11061), (3447, 6145), (3687, 5745)]