21205317

素因数分解:

$3^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{7951}}^1$

素因数の和:8088

約数の個数: 16

約数和(自身を含む): 32571392

約数和(自身を除く): 11366075

約数列:

[1, 3, 7, 21, 127, 381, 889, 2667, 7951, 23853, 55657, 166971, 1009777, 3029331, 7068439, 21205317]

約数ペア:

[(1, 21205317), (3, 7068439), (7, 3029331), (21, 1009777), (127, 166971), (381, 55657), (889, 23853), (2667, 7951)]