21287539

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{449}}^1\times {\mathrm{521}}^1$

素因数の和:990

約数の個数: 16

約数和(自身を含む): 26308800

約数和(自身を除く): 5021261

約数列:

[1, 7, 13, 91, 449, 521, 3143, 3647, 5837, 6773, 40859, 47411, 233929, 1637503, 3041077, 21287539]

約数ペア:

[(1, 21287539), (7, 3041077), (13, 1637503), (91, 233929), (449, 47411), (521, 40859), (3143, 6773), (3647, 5837)]