21278000

素因数分解:

$2^4\times 5^3\times {\mathrm{10639}}^1$

素因数の和:10662

約数の個数: 40

約数和(自身を含む): 51455040

約数和(自身を除く): 30177040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 2000, 10639, 21278, 42556, 53195, 85112, 106390, 170224, 212780, 265975, 425560, 531950, 851120, 1063900, 1329875, 2127800, 2659750, 4255600, 5319500, 10639000, 21278000]

約数ペア:

[(1, 21278000), (2, 10639000), (4, 5319500), (5, 4255600), (8, 2659750), (10, 2127800), (16, 1329875), (20, 1063900), (25, 851120), (40, 531950), (50, 425560), (80, 265975), (100, 212780), (125, 170224), (200, 106390), (250, 85112), (400, 53195), (500, 42556), (1000, 21278), (2000, 10639)]