21288825

素因数分解:

$3^4\times 5^2\times {\mathrm{10513}}^1$

素因数の和:10535

約数の個数: 30

約数和(自身を含む): 39438014

約数和(自身を除く): 18149189

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 135, 225, 405, 675, 2025, 10513, 31539, 52565, 94617, 157695, 262825, 283851, 473085, 788475, 851553, 1419255, 2365425, 4257765, 7096275, 21288825]

約数ペア:

[(1, 21288825), (3, 7096275), (5, 4257765), (9, 2365425), (15, 1419255), (25, 851553), (27, 788475), (45, 473085), (75, 283851), (81, 262825), (135, 157695), (225, 94617), (405, 52565), (675, 31539), (2025, 10513)]