21001040

素因数分解:

$2^4\times 5^1\times {\mathrm{262513}}^1$

素因数の和:262526

約数の個数: 20

約数和(自身を含む): 48827604

約数和(自身を除く): 27826564

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262513, 525026, 1050052, 1312565, 2100104, 2625130, 4200208, 5250260, 10500520, 21001040]

約数ペア:

[(1, 21001040), (2, 10500520), (4, 5250260), (5, 4200208), (8, 2625130), (10, 2100104), (16, 1312565), (20, 1050052), (40, 525026), (80, 262513)]