20289520

素因数分解:

$2^4\times 5^1\times {\mathrm{127}}^1\times {\mathrm{1997}}^1$

素因数の和:2137

約数の個数: 40

約数和(自身を含む): 47568384

約数和(自身を除く): 27278864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 127, 254, 508, 635, 1016, 1270, 1997, 2032, 2540, 3994, 5080, 7988, 9985, 10160, 15976, 19970, 31952, 39940, 79880, 159760, 253619, 507238, 1014476, 1268095, 2028952, 2536190, 4057904, 5072380, 10144760, 20289520]

約数ペア:

[(1, 20289520), (2, 10144760), (4, 5072380), (5, 4057904), (8, 2536190), (10, 2028952), (16, 1268095), (20, 1014476), (40, 507238), (80, 253619), (127, 159760), (254, 79880), (508, 39940), (635, 31952), (1016, 19970), (1270, 15976), (1997, 10160), (2032, 9985), (2540, 7988), (3994, 5080)]