81856120

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{251}}^1\times {\mathrm{263}}^1$

素因数の和:556

約数の個数: 64

約数和(自身を含む): 191600640

約数和(自身を除く): 109744520

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 251, 263, 310, 502, 526, 620, 1004, 1052, 1240, 1255, 1315, 2008, 2104, 2510, 2630, 5020, 5260, 7781, 8153, 10040, 10520, 15562, 16306, 31124, 32612, 38905, 40765, 62248, 65224, 66013, 77810, 81530, 132026, 155620, 163060, 264052, 311240, 326120, 330065, 528104, 660130, 1320260, 2046403, 2640520, 4092806, 8185612, 10232015, 16371224, 20464030, 40928060, 81856120]

約数ペア:

[(1, 81856120), (2, 40928060), (4, 20464030), (5, 16371224), (8, 10232015), (10, 8185612), (20, 4092806), (31, 2640520), (40, 2046403), (62, 1320260), (124, 660130), (155, 528104), (248, 330065), (251, 326120), (263, 311240), (310, 264052), (502, 163060), (526, 155620), (620, 132026), (1004, 81530), (1052, 77810), (1240, 66013), (1255, 65224), (1315, 62248), (2008, 40765), (2104, 38905), (2510, 32612), (2630, 31124), (5020, 16306), (5260, 15562), (7781, 10520), (8153, 10040)]