20189920

素因数分解:

$2^5\times 5^1\times {\mathrm{257}}^1\times {\mathrm{491}}^1$

素因数の和:763

約数の個数: 48

約数和(自身を含む): 47981808

約数和(自身を除く): 27791888

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 257, 491, 514, 982, 1028, 1285, 1964, 2056, 2455, 2570, 3928, 4112, 4910, 5140, 7856, 8224, 9820, 10280, 15712, 19640, 20560, 39280, 41120, 78560, 126187, 252374, 504748, 630935, 1009496, 1261870, 2018992, 2523740, 4037984, 5047480, 10094960, 20189920]

約数ペア:

[(1, 20189920), (2, 10094960), (4, 5047480), (5, 4037984), (8, 2523740), (10, 2018992), (16, 1261870), (20, 1009496), (32, 630935), (40, 504748), (80, 252374), (160, 126187), (257, 78560), (491, 41120), (514, 39280), (982, 20560), (1028, 19640), (1285, 15712), (1964, 10280), (2056, 9820), (2455, 8224), (2570, 7856), (3928, 5140), (4112, 4910)]