21071740

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{103}}^1\times {\mathrm{193}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 45759168

約数和(自身を除く): 24687428

約数列:

[1, 2, 4, 5, 10, 20, 53, 103, 106, 193, 206, 212, 265, 386, 412, 515, 530, 772, 965, 1030, 1060, 1930, 2060, 3860, 5459, 10229, 10918, 19879, 20458, 21836, 27295, 39758, 40916, 51145, 54590, 79516, 99395, 102290, 109180, 198790, 204580, 397580, 1053587, 2107174, 4214348, 5267935, 10535870, 21071740]

約数ペア:

[(1, 21071740), (2, 10535870), (4, 5267935), (5, 4214348), (10, 2107174), (20, 1053587), (53, 397580), (103, 204580), (106, 198790), (193, 109180), (206, 102290), (212, 99395), (265, 79516), (386, 54590), (412, 51145), (515, 40916), (530, 39758), (772, 27295), (965, 21836), (1030, 20458), (1060, 19879), (1930, 10918), (2060, 10229), (3860, 5459)]