21278195

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{3343}}^1$

素因数の和:3434

約数の個数: 16

約数和(自身を含む): 27287040

約数和(自身を除く): 6008845

約数列:

[1, 5, 19, 67, 95, 335, 1273, 3343, 6365, 16715, 63517, 223981, 317585, 1119905, 4255639, 21278195]

約数ペア:

[(1, 21278195), (5, 4255639), (19, 1119905), (67, 317585), (95, 223981), (335, 63517), (1273, 16715), (3343, 6365)]