19880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71}}^1$

素因数の和:89

約数の個数: 32

約数和(自身を含む): 51840

約数和(自身を除く): 31960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 71, 140, 142, 280, 284, 355, 497, 568, 710, 994, 1420, 1988, 2485, 2840, 3976, 4970, 9940, 19880]

約数ペア:

[(1, 19880), (2, 9940), (4, 4970), (5, 3976), (7, 2840), (8, 2485), (10, 1988), (14, 1420), (20, 994), (28, 710), (35, 568), (40, 497), (56, 355), (70, 284), (71, 280), (140, 142)]