21216265

素因数分解:

$5^1\times 7^3\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:254

約数の個数: 32

約数和(自身を含む): 30240000

約数和(自身を除く): 9023735

約数列:

[1, 5, 7, 35, 49, 89, 139, 245, 343, 445, 623, 695, 973, 1715, 3115, 4361, 4865, 6811, 12371, 21805, 30527, 34055, 47677, 61855, 86597, 152635, 238385, 432985, 606179, 3030895, 4243253, 21216265]

約数ペア:

[(1, 21216265), (5, 4243253), (7, 3030895), (35, 606179), (49, 432985), (89, 238385), (139, 152635), (245, 86597), (343, 61855), (445, 47677), (623, 34055), (695, 30527), (973, 21805), (1715, 12371), (3115, 6811), (4361, 4865)]