81125680

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{7741}}^1$

素因数の和:7885

約数の個数: 40

約数和(自身を含む): 190081584

約数和(自身を除く): 108955904

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 2096, 2620, 5240, 7741, 10480, 15482, 30964, 38705, 61928, 77410, 123856, 154820, 309640, 619280, 1014071, 2028142, 4056284, 5070355, 8112568, 10140710, 16225136, 20281420, 40562840, 81125680]

約数ペア:

[(1, 81125680), (2, 40562840), (4, 20281420), (5, 16225136), (8, 10140710), (10, 8112568), (16, 5070355), (20, 4056284), (40, 2028142), (80, 1014071), (131, 619280), (262, 309640), (524, 154820), (655, 123856), (1048, 77410), (1310, 61928), (2096, 38705), (2620, 30964), (5240, 15482), (7741, 10480)]