81215900

素因数分解:

$2^2\times 5^2\times {\mathrm{109}}^1\times {\mathrm{7451}}^1$

素因数の和:7574

約数の個数: 36

約数和(自身を含む): 177879240

約数和(自身を除く): 96663340

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 109, 218, 436, 545, 1090, 2180, 2725, 5450, 7451, 10900, 14902, 29804, 37255, 74510, 149020, 186275, 372550, 745100, 812159, 1624318, 3248636, 4060795, 8121590, 16243180, 20303975, 40607950, 81215900]

約数ペア:

[(1, 81215900), (2, 40607950), (4, 20303975), (5, 16243180), (10, 8121590), (20, 4060795), (25, 3248636), (50, 1624318), (100, 812159), (109, 745100), (218, 372550), (436, 186275), (545, 149020), (1090, 74510), (2180, 37255), (2725, 29804), (5450, 14902), (7451, 10900)]