20808080

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{8969}}^1$

素因数の和:9011

約数の個数: 40

約数和(自身を含む): 50052600

約数和(自身を除く): 29244520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 40, 58, 80, 116, 145, 232, 290, 464, 580, 1160, 2320, 8969, 17938, 35876, 44845, 71752, 89690, 143504, 179380, 260101, 358760, 520202, 717520, 1040404, 1300505, 2080808, 2601010, 4161616, 5202020, 10404040, 20808080]

約数ペア:

[(1, 20808080), (2, 10404040), (4, 5202020), (5, 4161616), (8, 2601010), (10, 2080808), (16, 1300505), (20, 1040404), (29, 717520), (40, 520202), (58, 358760), (80, 260101), (116, 179380), (145, 143504), (232, 89690), (290, 71752), (464, 44845), (580, 35876), (1160, 17938), (2320, 8969)]