21155239

素因数分解:

$7^1\times {\mathrm{23}}^2\times {\mathrm{29}}^1\times {\mathrm{197}}^1$

素因数の和:279

約数の個数: 24

約数和(自身を含む): 26278560

約数和(自身を除く): 5123321

約数列:

[1, 7, 23, 29, 161, 197, 203, 529, 667, 1379, 3703, 4531, 4669, 5713, 15341, 31717, 39991, 104213, 107387, 131399, 729491, 919793, 3022177, 21155239]

約数ペア:

[(1, 21155239), (7, 3022177), (23, 919793), (29, 729491), (161, 131399), (197, 107387), (203, 104213), (529, 39991), (667, 31717), (1379, 15341), (3703, 5713), (4531, 4669)]