21512385

素因数分解:

$3^4\times 5^1\times {\mathrm{53117}}^1$

素因数の和:53134

約数の個数: 20

約数和(自身を含む): 38563668

約数和(自身を除く): 17051283

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 53117, 159351, 265585, 478053, 796755, 1434159, 2390265, 4302477, 7170795, 21512385]

約数ペア:

[(1, 21512385), (3, 7170795), (5, 4302477), (9, 2390265), (15, 1434159), (27, 796755), (45, 478053), (81, 265585), (135, 159351), (405, 53117)]