21281547

素因数分解:

$3^1\times 7^1\times {\mathrm{307}}^1\times {\mathrm{3301}}^1$

素因数の和:3618

約数の個数: 16

約数和(自身を含む): 32544512

約数和(自身を除く): 11262965

約数列:

[1, 3, 7, 21, 307, 921, 2149, 3301, 6447, 9903, 23107, 69321, 1013407, 3040221, 7093849, 21281547]

約数ペア:

[(1, 21281547), (3, 7093849), (7, 3040221), (21, 1013407), (307, 69321), (921, 23107), (2149, 9903), (3301, 6447)]