21278800

素因数分解:

$2^4\times 5^2\times {\mathrm{53197}}^1$

素因数の和:53215

約数の個数: 30

約数和(自身を含む): 51123278

約数和(自身を除く): 29844478

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 53197, 106394, 212788, 265985, 425576, 531970, 851152, 1063940, 1329925, 2127880, 2659850, 4255760, 5319700, 10639400, 21278800]

約数ペア:

[(1, 21278800), (2, 10639400), (4, 5319700), (5, 4255760), (8, 2659850), (10, 2127880), (16, 1329925), (20, 1063940), (25, 851152), (40, 531970), (50, 425576), (80, 265985), (100, 212788), (200, 106394), (400, 53197)]