21398181

素因数分解:

$3^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{107}}^2$

素因数の和:313

約数の個数: 24

約数和(自身を含む): 33284160

約数和(自身を除く): 11885979

約数列:

[1, 3, 7, 21, 89, 107, 267, 321, 623, 749, 1869, 2247, 9523, 11449, 28569, 34347, 66661, 80143, 199983, 240429, 1018961, 3056883, 7132727, 21398181]

約数ペア:

[(1, 21398181), (3, 7132727), (7, 3056883), (21, 1018961), (89, 240429), (107, 199983), (267, 80143), (321, 66661), (623, 34347), (749, 28569), (1869, 11449), (2247, 9523)]