21809305

素因数分解:

$5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{21487}}^1$

素因数の和:21528

約数の個数: 16

約数和(自身を含む): 30942720

約数和(自身を除く): 9133415

約数列:

[1, 5, 7, 29, 35, 145, 203, 1015, 21487, 107435, 150409, 623123, 752045, 3115615, 4361861, 21809305]

約数ペア:

[(1, 21809305), (5, 4361861), (7, 3115615), (29, 752045), (35, 623123), (145, 150409), (203, 107435), (1015, 21487)]