21262905

素因数分解:

$3^4\times 5^1\times {\mathrm{52501}}^1$

素因数の和:52518

約数の個数: 20

約数和(自身を含む): 38116452

約数和(自身を除く): 16853547

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52501, 157503, 262505, 472509, 787515, 1417527, 2362545, 4252581, 7087635, 21262905]

約数ペア:

[(1, 21262905), (3, 7087635), (5, 4252581), (9, 2362545), (15, 1417527), (27, 787515), (45, 472509), (81, 262505), (135, 157503), (405, 52501)]