21136521

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{263}}^1$

素因数の和:405

約数の個数: 32

約数和(自身を含む): 33454080

約数和(自身を除く): 12317559

約数列:

[1, 3, 7, 21, 43, 89, 129, 263, 267, 301, 623, 789, 903, 1841, 1869, 3827, 5523, 11309, 11481, 23407, 26789, 33927, 70221, 79163, 80367, 163849, 237489, 491547, 1006501, 3019503, 7045507, 21136521]

約数ペア:

[(1, 21136521), (3, 7045507), (7, 3019503), (21, 1006501), (43, 491547), (89, 237489), (129, 163849), (263, 80367), (267, 79163), (301, 70221), (623, 33927), (789, 26789), (903, 23407), (1841, 11481), (1869, 11309), (3827, 5523)]