20797780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{229}}^1\times {\mathrm{239}}^1$

素因数の和:496

約数の個数: 48

約数和(自身を含む): 46368000

約数和(自身を除く): 25570220

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 229, 239, 380, 458, 478, 916, 956, 1145, 1195, 2290, 2390, 4351, 4541, 4580, 4780, 8702, 9082, 17404, 18164, 21755, 22705, 43510, 45410, 54731, 87020, 90820, 109462, 218924, 273655, 547310, 1039889, 1094620, 2079778, 4159556, 5199445, 10398890, 20797780]

約数ペア:

[(1, 20797780), (2, 10398890), (4, 5199445), (5, 4159556), (10, 2079778), (19, 1094620), (20, 1039889), (38, 547310), (76, 273655), (95, 218924), (190, 109462), (229, 90820), (239, 87020), (380, 54731), (458, 45410), (478, 43510), (916, 22705), (956, 21755), (1145, 18164), (1195, 17404), (2290, 9082), (2390, 8702), (4351, 4780), (4541, 4580)]