18887320

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:272

約数の個数: 64

約数和(自身を含む): 44352000

約数和(自身を除く): 25464680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 79, 86, 139, 158, 172, 215, 278, 316, 344, 395, 430, 556, 632, 695, 790, 860, 1112, 1390, 1580, 1720, 2780, 3160, 3397, 5560, 5977, 6794, 10981, 11954, 13588, 16985, 21962, 23908, 27176, 29885, 33970, 43924, 47816, 54905, 59770, 67940, 87848, 109810, 119540, 135880, 219620, 239080, 439240, 472183, 944366, 1888732, 2360915, 3777464, 4721830, 9443660, 18887320]

約数ペア:

[(1, 18887320), (2, 9443660), (4, 4721830), (5, 3777464), (8, 2360915), (10, 1888732), (20, 944366), (40, 472183), (43, 439240), (79, 239080), (86, 219620), (139, 135880), (158, 119540), (172, 109810), (215, 87848), (278, 67940), (316, 59770), (344, 54905), (395, 47816), (430, 43924), (556, 33970), (632, 29885), (695, 27176), (790, 23908), (860, 21962), (1112, 16985), (1390, 13588), (1580, 11954), (1720, 10981), (2780, 6794), (3160, 5977), (3397, 5560)]