21987287

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{3691}}^1$

素因数の和:3758

約数の個数: 16

約数和(自身を含む): 26936832

約数和(自身を除く): 4949545

約数列:

[1, 7, 23, 37, 161, 259, 851, 3691, 5957, 25837, 84893, 136567, 594251, 955969, 3141041, 21987287]

約数ペア:

[(1, 21987287), (7, 3141041), (23, 955969), (37, 594251), (161, 136567), (259, 84893), (851, 25837), (3691, 5957)]