21171880

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8677}}^1$

素因数の和:8749

約数の個数: 32

約数和(自身を含む): 48423240

約数和(自身を除く): 27251360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8677, 17354, 34708, 43385, 69416, 86770, 173540, 347080, 529297, 1058594, 2117188, 2646485, 4234376, 5292970, 10585940, 21171880]

約数ペア:

[(1, 21171880), (2, 10585940), (4, 5292970), (5, 4234376), (8, 2646485), (10, 2117188), (20, 1058594), (40, 529297), (61, 347080), (122, 173540), (244, 86770), (305, 69416), (488, 43385), (610, 34708), (1220, 17354), (2440, 8677)]