21251420

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11939}}^1$

素因数の和:12037

約数の個数: 24

約数和(自身を含む): 45133200

約数和(自身を除く): 23881780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11939, 23878, 47756, 59695, 119390, 238780, 1062571, 2125142, 4250284, 5312855, 10625710, 21251420]

約数ペア:

[(1, 21251420), (2, 10625710), (4, 5312855), (5, 4250284), (10, 2125142), (20, 1062571), (89, 238780), (178, 119390), (356, 59695), (445, 47756), (890, 23878), (1780, 11939)]