21809620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{155783}}^1$

素因数の和:155799

約数の個数: 24

約数和(自身を含む): 52343424

約数和(自身を除く): 30533804

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 155783, 311566, 623132, 778915, 1090481, 1557830, 2180962, 3115660, 4361924, 5452405, 10904810, 21809620]

約数ペア:

[(1, 21809620), (2, 10904810), (4, 5452405), (5, 4361924), (7, 3115660), (10, 2180962), (14, 1557830), (20, 1090481), (28, 778915), (35, 623132), (70, 311566), (140, 155783)]