20821815

素因数分解:

$3^2\times 5^1\times 7^3\times {\mathrm{19}}^1\times {\mathrm{71}}^1$

素因数の和:122

約数の個数: 96

約数和(自身を含む): 44928000

約数和(自身を除く): 24106185

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 45, 49, 57, 63, 71, 95, 105, 133, 147, 171, 213, 245, 285, 315, 343, 355, 399, 441, 497, 639, 665, 735, 855, 931, 1029, 1065, 1197, 1349, 1491, 1715, 1995, 2205, 2485, 2793, 3087, 3195, 3479, 4047, 4473, 4655, 5145, 5985, 6517, 6745, 7455, 8379, 9443, 10437, 12141, 13965, 15435, 17395, 19551, 20235, 22365, 24353, 28329, 31311, 32585, 41895, 47215, 52185, 58653, 60705, 66101, 73059, 84987, 97755, 121765, 141645, 156555, 198303, 219177, 293265, 330505, 365295, 424935, 462707, 594909, 991515, 1095885, 1388121, 2313535, 2974545, 4164363, 6940605, 20821815]

約数ペア:

[(1, 20821815), (3, 6940605), (5, 4164363), (7, 2974545), (9, 2313535), (15, 1388121), (19, 1095885), (21, 991515), (35, 594909), (45, 462707), (49, 424935), (57, 365295), (63, 330505), (71, 293265), (95, 219177), (105, 198303), (133, 156555), (147, 141645), (171, 121765), (213, 97755), (245, 84987), (285, 73059), (315, 66101), (343, 60705), (355, 58653), (399, 52185), (441, 47215), (497, 41895), (639, 32585), (665, 31311), (735, 28329), (855, 24353), (931, 22365), (1029, 20235), (1065, 19551), (1197, 17395), (1349, 15435), (1491, 13965), (1715, 12141), (1995, 10437), (2205, 9443), (2485, 8379), (2793, 7455), (3087, 6745), (3195, 6517), (3479, 5985), (4047, 5145), (4473, 4655)]