20984985

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{307}}^1$

素因数の和:363

約数の個数: 72

約数和(自身を含む): 43819776

約数和(自身を除く): 22834791

約数列:

[1, 3, 5, 7, 9, 15, 21, 31, 35, 45, 49, 63, 93, 105, 147, 155, 217, 245, 279, 307, 315, 441, 465, 651, 735, 921, 1085, 1395, 1519, 1535, 1953, 2149, 2205, 2763, 3255, 4557, 4605, 6447, 7595, 9517, 9765, 10745, 13671, 13815, 15043, 19341, 22785, 28551, 32235, 45129, 47585, 66619, 68355, 75215, 85653, 96705, 135387, 142755, 199857, 225645, 333095, 428265, 466333, 599571, 676935, 999285, 1398999, 2331665, 2997855, 4196997, 6994995, 20984985]

約数ペア:

[(1, 20984985), (3, 6994995), (5, 4196997), (7, 2997855), (9, 2331665), (15, 1398999), (21, 999285), (31, 676935), (35, 599571), (45, 466333), (49, 428265), (63, 333095), (93, 225645), (105, 199857), (147, 142755), (155, 135387), (217, 96705), (245, 85653), (279, 75215), (307, 68355), (315, 66619), (441, 47585), (465, 45129), (651, 32235), (735, 28551), (921, 22785), (1085, 19341), (1395, 15043), (1519, 13815), (1535, 13671), (1953, 10745), (2149, 9765), (2205, 9517), (2763, 7595), (3255, 6447), (4557, 4605)]