81861520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78713}}^1$

素因数の和:78739

約数の個数: 40

約数和(自身を含む): 204971256

約数和(自身を除く): 123109736

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78713, 157426, 314852, 393565, 629704, 787130, 1023269, 1259408, 1574260, 2046538, 3148520, 4093076, 5116345, 6297040, 8186152, 10232690, 16372304, 20465380, 40930760, 81861520]

約数ペア:

[(1, 81861520), (2, 40930760), (4, 20465380), (5, 16372304), (8, 10232690), (10, 8186152), (13, 6297040), (16, 5116345), (20, 4093076), (26, 3148520), (40, 2046538), (52, 1574260), (65, 1259408), (80, 1023269), (104, 787130), (130, 629704), (208, 393565), (260, 314852), (520, 157426), (1040, 78713)]