21289815

素因数分解:

$3^2\times 5^1\times {\mathrm{191}}^1\times {\mathrm{2477}}^1$

素因数の和:2679

約数の個数: 24

約数和(自身を含む): 37110528

約数和(自身を除く): 15820713

約数列:

[1, 3, 5, 9, 15, 45, 191, 573, 955, 1719, 2477, 2865, 7431, 8595, 12385, 22293, 37155, 111465, 473107, 1419321, 2365535, 4257963, 7096605, 21289815]

約数ペア:

[(1, 21289815), (3, 7096605), (5, 4257963), (9, 2365535), (15, 1419321), (45, 473107), (191, 111465), (573, 37155), (955, 22293), (1719, 12385), (2477, 8595), (2865, 7431)]