21721191

素因数分解:

$3^1\times {\mathrm{47}}^1\times {\mathrm{127}}^1\times {\mathrm{1213}}^1$

素因数の和:1390

約数の個数: 16

約数和(自身を含む): 29835264

約数和(自身を除く): 8114073

約数列:

[1, 3, 47, 127, 141, 381, 1213, 3639, 5969, 17907, 57011, 154051, 171033, 462153, 7240397, 21721191]

約数ペア:

[(1, 21721191), (3, 7240397), (47, 462153), (127, 171033), (141, 154051), (381, 57011), (1213, 17907), (3639, 5969)]