21505420

素因数分解:

$2^2\times 5^1\times {\mathrm{151}}^1\times {\mathrm{7121}}^1$

素因数の和:7281

約数の個数: 24

約数和(自身を含む): 45466848

約数和(自身を除く): 23961428

約数列:

[1, 2, 4, 5, 10, 20, 151, 302, 604, 755, 1510, 3020, 7121, 14242, 28484, 35605, 71210, 142420, 1075271, 2150542, 4301084, 5376355, 10752710, 21505420]

約数ペア:

[(1, 21505420), (2, 10752710), (4, 5376355), (5, 4301084), (10, 2150542), (20, 1075271), (151, 142420), (302, 71210), (604, 35605), (755, 28484), (1510, 14242), (3020, 7121)]