21180080

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{131}}^1$

素因数の和:234

約数の個数: 80

約数和(自身を含む): 51853824

約数和(自身を除く): 30673744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 47, 80, 86, 94, 131, 172, 188, 215, 235, 262, 344, 376, 430, 470, 524, 655, 688, 752, 860, 940, 1048, 1310, 1720, 1880, 2021, 2096, 2620, 3440, 3760, 4042, 5240, 5633, 6157, 8084, 10105, 10480, 11266, 12314, 16168, 20210, 22532, 24628, 28165, 30785, 32336, 40420, 45064, 49256, 56330, 61570, 80840, 90128, 98512, 112660, 123140, 161680, 225320, 246280, 264751, 450640, 492560, 529502, 1059004, 1323755, 2118008, 2647510, 4236016, 5295020, 10590040, 21180080]

約数ペア:

[(1, 21180080), (2, 10590040), (4, 5295020), (5, 4236016), (8, 2647510), (10, 2118008), (16, 1323755), (20, 1059004), (40, 529502), (43, 492560), (47, 450640), (80, 264751), (86, 246280), (94, 225320), (131, 161680), (172, 123140), (188, 112660), (215, 98512), (235, 90128), (262, 80840), (344, 61570), (376, 56330), (430, 49256), (470, 45064), (524, 40420), (655, 32336), (688, 30785), (752, 28165), (860, 24628), (940, 22532), (1048, 20210), (1310, 16168), (1720, 12314), (1880, 11266), (2021, 10480), (2096, 10105), (2620, 8084), (3440, 6157), (3760, 5633), (4042, 5240)]