21090915

素因数分解:

$3^3\times 5^1\times {\mathrm{156229}}^1$

素因数の和:156243

約数の個数: 16

約数和(自身を含む): 37495200

約数和(自身を除く): 16404285

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 156229, 468687, 781145, 1406061, 2343435, 4218183, 7030305, 21090915]

約数ペア:

[(1, 21090915), (3, 7030305), (5, 4218183), (9, 2343435), (15, 1406061), (27, 781145), (45, 468687), (135, 156229)]