21685480

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^2\times {\mathrm{193}}^1$

素因数の和:310

約数の個数: 48

約数和(自身を含む): 49987980

約数和(自身を除く): 28302500

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 193, 212, 265, 386, 424, 530, 772, 965, 1060, 1544, 1930, 2120, 2809, 3860, 5618, 7720, 10229, 11236, 14045, 20458, 22472, 28090, 40916, 51145, 56180, 81832, 102290, 112360, 204580, 409160, 542137, 1084274, 2168548, 2710685, 4337096, 5421370, 10842740, 21685480]

約数ペア:

[(1, 21685480), (2, 10842740), (4, 5421370), (5, 4337096), (8, 2710685), (10, 2168548), (20, 1084274), (40, 542137), (53, 409160), (106, 204580), (193, 112360), (212, 102290), (265, 81832), (386, 56180), (424, 51145), (530, 40916), (772, 28090), (965, 22472), (1060, 20458), (1544, 14045), (1930, 11236), (2120, 10229), (2809, 7720), (3860, 5618)]