20775880

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{257}}^1$

素因数の和:358

約数の個数: 64

約数和(自身を含む): 49040640

約数和(自身を除く): 28264760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 47, 86, 94, 172, 188, 215, 235, 257, 344, 376, 430, 470, 514, 860, 940, 1028, 1285, 1720, 1880, 2021, 2056, 2570, 4042, 5140, 8084, 10105, 10280, 11051, 12079, 16168, 20210, 22102, 24158, 40420, 44204, 48316, 55255, 60395, 80840, 88408, 96632, 110510, 120790, 221020, 241580, 442040, 483160, 519397, 1038794, 2077588, 2596985, 4155176, 5193970, 10387940, 20775880]

約数ペア:

[(1, 20775880), (2, 10387940), (4, 5193970), (5, 4155176), (8, 2596985), (10, 2077588), (20, 1038794), (40, 519397), (43, 483160), (47, 442040), (86, 241580), (94, 221020), (172, 120790), (188, 110510), (215, 96632), (235, 88408), (257, 80840), (344, 60395), (376, 55255), (430, 48316), (470, 44204), (514, 40420), (860, 24158), (940, 22102), (1028, 20210), (1285, 16168), (1720, 12079), (1880, 11051), (2021, 10280), (2056, 10105), (2570, 8084), (4042, 5140)]