21979195

素因数分解:

$5^1\times 7^2\times {\mathrm{283}}^1\times {\mathrm{317}}^1$

素因数の和:619

約数の個数: 24

約数和(自身を含む): 30886704

約数和(自身を除く): 8907509

約数列:

[1, 5, 7, 35, 49, 245, 283, 317, 1415, 1585, 1981, 2219, 9905, 11095, 13867, 15533, 69335, 77665, 89711, 448555, 627977, 3139885, 4395839, 21979195]

約数ペア:

[(1, 21979195), (5, 4395839), (7, 3139885), (35, 627977), (49, 448555), (245, 89711), (283, 77665), (317, 69335), (1415, 15533), (1585, 13867), (1981, 11095), (2219, 9905)]