20905605

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{499}}^1$

素因数の和:543

約数の個数: 72

約数和(自身を含む): 44460000

約数和(自身を除く): 23554395

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 45, 49, 57, 63, 95, 105, 133, 147, 171, 245, 285, 315, 399, 441, 499, 665, 735, 855, 931, 1197, 1497, 1995, 2205, 2495, 2793, 3493, 4491, 4655, 5985, 7485, 8379, 9481, 10479, 13965, 17465, 22455, 24451, 28443, 31437, 41895, 47405, 52395, 66367, 73353, 85329, 122255, 142215, 157185, 199101, 220059, 331835, 366765, 426645, 464569, 597303, 995505, 1100295, 1393707, 2322845, 2986515, 4181121, 6968535, 20905605]

約数ペア:

[(1, 20905605), (3, 6968535), (5, 4181121), (7, 2986515), (9, 2322845), (15, 1393707), (19, 1100295), (21, 995505), (35, 597303), (45, 464569), (49, 426645), (57, 366765), (63, 331835), (95, 220059), (105, 199101), (133, 157185), (147, 142215), (171, 122255), (245, 85329), (285, 73353), (315, 66367), (399, 52395), (441, 47405), (499, 41895), (665, 31437), (735, 28443), (855, 24451), (931, 22455), (1197, 17465), (1497, 13965), (1995, 10479), (2205, 9481), (2495, 8379), (2793, 7485), (3493, 5985), (4491, 4655)]