81491560

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{65719}}^1$

素因数の和:65761

約数の個数: 32

約数和(自身を含む): 189273600

約数和(自身を除く): 107782040

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 65719, 131438, 262876, 328595, 525752, 657190, 1314380, 2037289, 2628760, 4074578, 8149156, 10186445, 16298312, 20372890, 40745780, 81491560]

約数ペア:

[(1, 81491560), (2, 40745780), (4, 20372890), (5, 16298312), (8, 10186445), (10, 8149156), (20, 4074578), (31, 2628760), (40, 2037289), (62, 1314380), (124, 657190), (155, 525752), (248, 328595), (310, 262876), (620, 131438), (1240, 65719)]