21004240

素因数分解:

$2^4\times 5^1\times {\mathrm{262553}}^1$

素因数の和:262566

約数の個数: 20

約数和(自身を含む): 48835044

約数和(自身を除く): 27830804

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262553, 525106, 1050212, 1312765, 2100424, 2625530, 4200848, 5251060, 10502120, 21004240]

約数ペア:

[(1, 21004240), (2, 10502120), (4, 5251060), (5, 4200848), (8, 2625530), (10, 2100424), (16, 1312765), (20, 1050212), (40, 525106), (80, 262553)]