19968740

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{653}}^1$

素因数の和:812

約数の個数: 48

約数和(自身を含む): 46146240

約数和(自身を除く): 26177500

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 139, 220, 278, 556, 653, 695, 1306, 1390, 1529, 2612, 2780, 3058, 3265, 6116, 6530, 7183, 7645, 13060, 14366, 15290, 28732, 30580, 35915, 71830, 90767, 143660, 181534, 363068, 453835, 907670, 998437, 1815340, 1996874, 3993748, 4992185, 9984370, 19968740]

約数ペア:

[(1, 19968740), (2, 9984370), (4, 4992185), (5, 3993748), (10, 1996874), (11, 1815340), (20, 998437), (22, 907670), (44, 453835), (55, 363068), (110, 181534), (139, 143660), (220, 90767), (278, 71830), (556, 35915), (653, 30580), (695, 28732), (1306, 15290), (1390, 14366), (1529, 13060), (2612, 7645), (2780, 7183), (3058, 6530), (3265, 6116)]