21391275

素因数分解:

$3^1\times 5^2\times {\mathrm{223}}^1\times {\mathrm{1279}}^1$

素因数の和:1515

約数の個数: 24

約数和(自身を含む): 35553280

約数和(自身を除く): 14162005

約数列:

[1, 3, 5, 15, 25, 75, 223, 669, 1115, 1279, 3345, 3837, 5575, 6395, 16725, 19185, 31975, 95925, 285217, 855651, 1426085, 4278255, 7130425, 21391275]

約数ペア:

[(1, 21391275), (3, 7130425), (5, 4278255), (15, 1426085), (25, 855651), (75, 285217), (223, 95925), (669, 31975), (1115, 19185), (1279, 16725), (3345, 6395), (3837, 5575)]