21278235

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{128959}}^1$

素因数の和:128978

約数の個数: 16

約数和(自身を含む): 37140480

約数和(自身を除く): 15862245

約数列:

[1, 3, 5, 11, 15, 33, 55, 165, 128959, 386877, 644795, 1418549, 1934385, 4255647, 7092745, 21278235]

約数ペア:

[(1, 21278235), (3, 7092745), (5, 4255647), (11, 1934385), (15, 1418549), (33, 644795), (55, 386877), (165, 128959)]