18978975

素因数分解:

$3^3\times 5^2\times {\mathrm{31}}^1\times {\mathrm{907}}^1$

素因数の和:957

約数の個数: 48

約数和(自身を含む): 36029440

約数和(自身を除く): 17050465

約数列:

[1, 3, 5, 9, 15, 25, 27, 31, 45, 75, 93, 135, 155, 225, 279, 465, 675, 775, 837, 907, 1395, 2325, 2721, 4185, 4535, 6975, 8163, 13605, 20925, 22675, 24489, 28117, 40815, 68025, 84351, 122445, 140585, 204075, 253053, 421755, 612225, 702925, 759159, 1265265, 2108775, 3795795, 6326325, 18978975]

約数ペア:

[(1, 18978975), (3, 6326325), (5, 3795795), (9, 2108775), (15, 1265265), (25, 759159), (27, 702925), (31, 612225), (45, 421755), (75, 253053), (93, 204075), (135, 140585), (155, 122445), (225, 84351), (279, 68025), (465, 40815), (675, 28117), (775, 24489), (837, 22675), (907, 20925), (1395, 13605), (2325, 8163), (2721, 6975), (4185, 4535)]