21398985

素因数分解:

$3^4\times 5^1\times {\mathrm{52837}}^1$

素因数の和:52854

約数の個数: 20

約数和(自身を含む): 38360388

約数和(自身を除く): 16961403

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52837, 158511, 264185, 475533, 792555, 1426599, 2377665, 4279797, 7132995, 21398985]

約数ペア:

[(1, 21398985), (3, 7132995), (5, 4279797), (9, 2377665), (15, 1426599), (27, 792555), (45, 475533), (81, 264185), (135, 158511), (405, 52837)]