21387609

素因数分解:

$3^2\times {\mathrm{41}}^1\times {\mathrm{149}}^1\times {\mathrm{389}}^1$

素因数の和:585

約数の個数: 24

約数和(自身を含む): 31941000

約数和(自身を除く): 10553391

約数列:

[1, 3, 9, 41, 123, 149, 369, 389, 447, 1167, 1341, 3501, 6109, 15949, 18327, 47847, 54981, 57961, 143541, 173883, 521649, 2376401, 7129203, 21387609]

約数ペア:

[(1, 21387609), (3, 7129203), (9, 2376401), (41, 521649), (123, 173883), (149, 143541), (369, 57961), (389, 54981), (447, 47847), (1167, 18327), (1341, 15949), (3501, 6109)]