21905147

素因数分解:

${\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{107}}^1\times {\mathrm{503}}^1$

素因数の和:658

約数の個数: 16

約数和(自身を含む): 24820992

約数和(自身を除く): 2915845

約数列:

[1, 11, 37, 107, 407, 503, 1177, 3959, 5533, 18611, 43549, 53821, 204721, 592031, 1991377, 21905147]

約数ペア:

[(1, 21905147), (11, 1991377), (37, 592031), (107, 204721), (407, 53821), (503, 43549), (1177, 18611), (3959, 5533)]