20872005

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{1063}}^1$

素因数の和:1106

約数の個数: 64

約数和(自身を含む): 44126208

約数和(自身を除く): 23254203

約数列:

[1, 3, 5, 7, 11, 15, 17, 21, 33, 35, 51, 55, 77, 85, 105, 119, 165, 187, 231, 255, 357, 385, 561, 595, 935, 1063, 1155, 1309, 1785, 2805, 3189, 3927, 5315, 6545, 7441, 11693, 15945, 18071, 19635, 22323, 35079, 37205, 54213, 58465, 81851, 90355, 111615, 126497, 175395, 198781, 245553, 271065, 379491, 409255, 596343, 632485, 993905, 1227765, 1391467, 1897455, 2981715, 4174401, 6957335, 20872005]

約数ペア:

[(1, 20872005), (3, 6957335), (5, 4174401), (7, 2981715), (11, 1897455), (15, 1391467), (17, 1227765), (21, 993905), (33, 632485), (35, 596343), (51, 409255), (55, 379491), (77, 271065), (85, 245553), (105, 198781), (119, 175395), (165, 126497), (187, 111615), (231, 90355), (255, 81851), (357, 58465), (385, 54213), (561, 37205), (595, 35079), (935, 22323), (1063, 19635), (1155, 18071), (1309, 15945), (1785, 11693), (2805, 7441), (3189, 6545), (3927, 5315)]