81499840

素因数分解:

$2^6\times 5^1\times {\mathrm{257}}^1\times {\mathrm{991}}^1$

素因数の和:1265

約数の個数: 56

約数和(自身を含む): 195023232

約数和(自身を除く): 113523392

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 257, 320, 514, 991, 1028, 1285, 1982, 2056, 2570, 3964, 4112, 4955, 5140, 7928, 8224, 9910, 10280, 15856, 16448, 19820, 20560, 31712, 39640, 41120, 63424, 79280, 82240, 158560, 254687, 317120, 509374, 1018748, 1273435, 2037496, 2546870, 4074992, 5093740, 8149984, 10187480, 16299968, 20374960, 40749920, 81499840]

約数ペア:

[(1, 81499840), (2, 40749920), (4, 20374960), (5, 16299968), (8, 10187480), (10, 8149984), (16, 5093740), (20, 4074992), (32, 2546870), (40, 2037496), (64, 1273435), (80, 1018748), (160, 509374), (257, 317120), (320, 254687), (514, 158560), (991, 82240), (1028, 79280), (1285, 63424), (1982, 41120), (2056, 39640), (2570, 31712), (3964, 20560), (4112, 19820), (4955, 16448), (5140, 15856), (7928, 10280), (8224, 9910)]