21005285

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{821}}^1$

素因数の和:893

約数の個数: 32

約数和(自身を含む): 31249152

約数和(自身を除く): 10243867

約数列:

[1, 5, 7, 17, 35, 43, 85, 119, 215, 301, 595, 731, 821, 1505, 3655, 4105, 5117, 5747, 13957, 25585, 28735, 35303, 69785, 97699, 176515, 247121, 488495, 600151, 1235605, 3000755, 4201057, 21005285]

約数ペア:

[(1, 21005285), (5, 4201057), (7, 3000755), (17, 1235605), (35, 600151), (43, 488495), (85, 247121), (119, 176515), (215, 97699), (301, 69785), (595, 35303), (731, 28735), (821, 25585), (1505, 13957), (3655, 5747), (4105, 5117)]