21505005

素因数分解:

$3^2\times 5^1\times {\mathrm{223}}^1\times {\mathrm{2143}}^1$

素因数の和:2377

約数の個数: 24

約数和(自身を含む): 37459968

約数和(自身を除く): 15954963

約数列:

[1, 3, 5, 9, 15, 45, 223, 669, 1115, 2007, 2143, 3345, 6429, 10035, 10715, 19287, 32145, 96435, 477889, 1433667, 2389445, 4301001, 7168335, 21505005]

約数ペア:

[(1, 21505005), (3, 7168335), (5, 4301001), (9, 2389445), (15, 1433667), (45, 477889), (223, 96435), (669, 32145), (1115, 19287), (2007, 10715), (2143, 10035), (3345, 6429)]