20705680

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3863}}^1$

素因数の和:3943

約数の個数: 40

約数和(自身を含む): 48871872

約数和(自身を除く): 28166192

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3863, 5360, 7726, 15452, 19315, 30904, 38630, 61808, 77260, 154520, 258821, 309040, 517642, 1035284, 1294105, 2070568, 2588210, 4141136, 5176420, 10352840, 20705680]

約数ペア:

[(1, 20705680), (2, 10352840), (4, 5176420), (5, 4141136), (8, 2588210), (10, 2070568), (16, 1294105), (20, 1035284), (40, 517642), (67, 309040), (80, 258821), (134, 154520), (268, 77260), (335, 61808), (536, 38630), (670, 30904), (1072, 19315), (1340, 15452), (2680, 7726), (3863, 5360)]