21021515

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1\times {\mathrm{439}}^1$

素因数の和:662

約数の個数: 16

約数和(自身を含む): 25861440

約数和(自身を除く): 4839925

約数列:

[1, 5, 61, 157, 305, 439, 785, 2195, 9577, 26779, 47885, 68923, 133895, 344615, 4204303, 21021515]

約数ペア:

[(1, 21021515), (5, 4204303), (61, 344615), (157, 133895), (305, 68923), (439, 47885), (785, 26779), (2195, 9577)]