21499880

素因数分解:

$2^3\times 5^1\times {\mathrm{537497}}^1$

素因数の和:537508

約数の個数: 16

約数和(自身を含む): 48374820

約数和(自身を除く): 26874940

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 537497, 1074994, 2149988, 2687485, 4299976, 5374970, 10749940, 21499880]

約数ペア:

[(1, 21499880), (2, 10749940), (4, 5374970), (5, 4299976), (8, 2687485), (10, 2149988), (20, 1074994), (40, 537497)]