21513205

素因数分解:

$5^1\times 7^2\times {\mathrm{277}}^1\times {\mathrm{317}}^1$

素因数の和:613

約数の個数: 24

約数和(自身を含む): 30234168

約数和(自身を除く): 8720963

約数列:

[1, 5, 7, 35, 49, 245, 277, 317, 1385, 1585, 1939, 2219, 9695, 11095, 13573, 15533, 67865, 77665, 87809, 439045, 614663, 3073315, 4302641, 21513205]

約数ペア:

[(1, 21513205), (5, 4302641), (7, 3073315), (35, 614663), (49, 439045), (245, 87809), (277, 77665), (317, 67865), (1385, 15533), (1585, 13573), (1939, 11095), (2219, 9695)]