81685760

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4909}}^1$

素因数の和:4943

約数の個数: 72

約数和(自身を含む): 210756840

約数和(自身を除く): 129071080

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 520, 640, 832, 1040, 1280, 1664, 2080, 3328, 4160, 4909, 8320, 9818, 16640, 19636, 24545, 39272, 49090, 63817, 78544, 98180, 127634, 157088, 196360, 255268, 314176, 319085, 392720, 510536, 628352, 638170, 785440, 1021072, 1256704, 1276340, 1570880, 2042144, 2552680, 3141760, 4084288, 5105360, 6283520, 8168576, 10210720, 16337152, 20421440, 40842880, 81685760]

約数ペア:

[(1, 81685760), (2, 40842880), (4, 20421440), (5, 16337152), (8, 10210720), (10, 8168576), (13, 6283520), (16, 5105360), (20, 4084288), (26, 3141760), (32, 2552680), (40, 2042144), (52, 1570880), (64, 1276340), (65, 1256704), (80, 1021072), (104, 785440), (128, 638170), (130, 628352), (160, 510536), (208, 392720), (256, 319085), (260, 314176), (320, 255268), (416, 196360), (520, 157088), (640, 127634), (832, 98180), (1040, 78544), (1280, 63817), (1664, 49090), (2080, 39272), (3328, 24545), (4160, 19636), (4909, 16640), (8320, 9818)]