21209587

素因数分解:

$7^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{1103}}^1$

素因数の和:1218

約数の個数: 16

約数和(自身を含む): 25224192

約数和(自身を除く): 4014605

約数列:

[1, 7, 41, 67, 287, 469, 1103, 2747, 7721, 19229, 45223, 73901, 316561, 517307, 3029941, 21209587]

約数ペア:

[(1, 21209587), (7, 3029941), (41, 517307), (67, 316561), (287, 73901), (469, 45223), (1103, 19229), (2747, 7721)]