81640360

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{65839}}^1$

素因数の和:65881

約数の個数: 32

約数和(自身を含む): 189619200

約数和(自身を除く): 107978840

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 65839, 131678, 263356, 329195, 526712, 658390, 1316780, 2041009, 2633560, 4082018, 8164036, 10205045, 16328072, 20410090, 40820180, 81640360]

約数ペア:

[(1, 81640360), (2, 40820180), (4, 20410090), (5, 16328072), (8, 10205045), (10, 8164036), (20, 4082018), (31, 2633560), (40, 2041009), (62, 1316780), (124, 658390), (155, 526712), (248, 329195), (310, 263356), (620, 131678), (1240, 65839)]