21042175

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{643}}^1$

素因数の和:688

約数の個数: 48

約数和(自身を含む): 34497792

約数和(自身を除く): 13455617

約数列:

[1, 5, 7, 11, 17, 25, 35, 55, 77, 85, 119, 175, 187, 275, 385, 425, 595, 643, 935, 1309, 1925, 2975, 3215, 4501, 4675, 6545, 7073, 10931, 16075, 22505, 32725, 35365, 49511, 54655, 76517, 112525, 120241, 176825, 247555, 273275, 382585, 601205, 841687, 1237775, 1912925, 3006025, 4208435, 21042175]

約数ペア:

[(1, 21042175), (5, 4208435), (7, 3006025), (11, 1912925), (17, 1237775), (25, 841687), (35, 601205), (55, 382585), (77, 273275), (85, 247555), (119, 176825), (175, 120241), (187, 112525), (275, 76517), (385, 54655), (425, 49511), (595, 35365), (643, 32725), (935, 22505), (1309, 16075), (1925, 10931), (2975, 7073), (3215, 6545), (4501, 4675)]