21406420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{1429}}^1$

素因数の和:1552

約数の個数: 48

約数和(自身を含む): 51891840

約数和(自身を除く): 30485420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 107, 140, 214, 428, 535, 749, 1070, 1429, 1498, 2140, 2858, 2996, 3745, 5716, 7145, 7490, 10003, 14290, 14980, 20006, 28580, 40012, 50015, 100030, 152903, 200060, 305806, 611612, 764515, 1070321, 1529030, 2140642, 3058060, 4281284, 5351605, 10703210, 21406420]

約数ペア:

[(1, 21406420), (2, 10703210), (4, 5351605), (5, 4281284), (7, 3058060), (10, 2140642), (14, 1529030), (20, 1070321), (28, 764515), (35, 611612), (70, 305806), (107, 200060), (140, 152903), (214, 100030), (428, 50015), (535, 40012), (749, 28580), (1070, 20006), (1429, 14980), (1498, 14290), (2140, 10003), (2858, 7490), (2996, 7145), (3745, 5716)]