21780045

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{69143}}^1$

素因数の和:69161

約数の個数: 24

約数和(自身を含む): 43145856

約数和(自身を除く): 21365811

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315, 69143, 207429, 345715, 484001, 622287, 1037145, 1452003, 2420005, 3111435, 4356009, 7260015, 21780045]

約数ペア:

[(1, 21780045), (3, 7260015), (5, 4356009), (7, 3111435), (9, 2420005), (15, 1452003), (21, 1037145), (35, 622287), (45, 484001), (63, 345715), (105, 207429), (315, 69143)]