21511021

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{197}}^1\times {\mathrm{821}}^1$

素因数の和:1044

約数の個数: 16

約数和(自身を含む): 26040960

約数和(自身を除く): 4529939

約数列:

[1, 7, 19, 133, 197, 821, 1379, 3743, 5747, 15599, 26201, 109193, 161737, 1132159, 3073003, 21511021]

約数ペア:

[(1, 21511021), (7, 3073003), (19, 1132159), (133, 161737), (197, 109193), (821, 26201), (1379, 15599), (3743, 5747)]