81736280

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{7951}}^1$

素因数の和:8219

約数の個数: 32

約数和(自身を含む): 184645440

約数和(自身を除く): 102909160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2570, 5140, 7951, 10280, 15902, 31804, 39755, 63608, 79510, 159020, 318040, 2043407, 4086814, 8173628, 10217035, 16347256, 20434070, 40868140, 81736280]

約数ペア:

[(1, 81736280), (2, 40868140), (4, 20434070), (5, 16347256), (8, 10217035), (10, 8173628), (20, 4086814), (40, 2043407), (257, 318040), (514, 159020), (1028, 79510), (1285, 63608), (2056, 39755), (2570, 31804), (5140, 15902), (7951, 10280)]