81407320

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{7919}}^1$

素因数の和:8187

約数の個数: 32

約数和(自身を含む): 183902400

約数和(自身を除く): 102495080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2570, 5140, 7919, 10280, 15838, 31676, 39595, 63352, 79190, 158380, 316760, 2035183, 4070366, 8140732, 10175915, 16281464, 20351830, 40703660, 81407320]

約数ペア:

[(1, 81407320), (2, 40703660), (4, 20351830), (5, 16281464), (8, 10175915), (10, 8140732), (20, 4070366), (40, 2035183), (257, 316760), (514, 158380), (1028, 79190), (1285, 63352), (2056, 39595), (2570, 31676), (5140, 15838), (7919, 10280)]