19880180

素因数分解:

$2^2\times 5^1\times {\mathrm{997}}^2$

素因数の和:2003

約数の個数: 18

約数和(自身を含む): 41790294

約数和(自身を除く): 21910114

約数列:

[1, 2, 4, 5, 10, 20, 997, 1994, 3988, 4985, 9970, 19940, 994009, 1988018, 3976036, 4970045, 9940090, 19880180]

約数ペア:

[(1, 19880180), (2, 9940090), (4, 4970045), (5, 3976036), (10, 1988018), (20, 994009), (997, 19940), (1994, 9970), (3988, 4985)]