21257560

素因数分解:

$2^3\times 5^1\times {\mathrm{113}}^1\times {\mathrm{4703}}^1$

素因数の和:4827

約数の個数: 32

約数和(自身を含む): 48263040

約数和(自身を除く): 27005480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 113, 226, 452, 565, 904, 1130, 2260, 4520, 4703, 9406, 18812, 23515, 37624, 47030, 94060, 188120, 531439, 1062878, 2125756, 2657195, 4251512, 5314390, 10628780, 21257560]

約数ペア:

[(1, 21257560), (2, 10628780), (4, 5314390), (5, 4251512), (8, 2657195), (10, 2125756), (20, 1062878), (40, 531439), (113, 188120), (226, 94060), (452, 47030), (565, 37624), (904, 23515), (1130, 18812), (2260, 9406), (4520, 4703)]