21261405

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{128857}}^1$

素因数の和:128876

約数の個数: 16

約数和(自身を含む): 37111104

約数和(自身を除く): 15849699

約数列:

[1, 3, 5, 11, 15, 33, 55, 165, 128857, 386571, 644285, 1417427, 1932855, 4252281, 7087135, 21261405]

約数ペア:

[(1, 21261405), (3, 7087135), (5, 4252281), (11, 1932855), (15, 1417427), (33, 644285), (55, 386571), (165, 128857)]