20784140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79939}}^1$

素因数の和:79961

約数の個数: 24

約数和(自身を含む): 47004720

約数和(自身を除く): 26220580

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 79939, 159878, 319756, 399695, 799390, 1039207, 1598780, 2078414, 4156828, 5196035, 10392070, 20784140]

約数ペア:

[(1, 20784140), (2, 10392070), (4, 5196035), (5, 4156828), (10, 2078414), (13, 1598780), (20, 1039207), (26, 799390), (52, 399695), (65, 319756), (130, 159878), (260, 79939)]