21505700

素因数分解:

$2^2\times 5^2\times {\mathrm{109}}^1\times {\mathrm{1973}}^1$

素因数の和:2096

約数の個数: 36

約数和(自身を含む): 47119380

約数和(自身を除く): 25613680

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 109, 218, 436, 545, 1090, 1973, 2180, 2725, 3946, 5450, 7892, 9865, 10900, 19730, 39460, 49325, 98650, 197300, 215057, 430114, 860228, 1075285, 2150570, 4301140, 5376425, 10752850, 21505700]

約数ペア:

[(1, 21505700), (2, 10752850), (4, 5376425), (5, 4301140), (10, 2150570), (20, 1075285), (25, 860228), (50, 430114), (100, 215057), (109, 197300), (218, 98650), (436, 49325), (545, 39460), (1090, 19730), (1973, 10900), (2180, 9865), (2725, 7892), (3946, 5450)]