21008780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{80803}}^1$

素因数の和:80825

約数の個数: 24

約数和(自身を含む): 47512752

約数和(自身を除く): 26503972

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 80803, 161606, 323212, 404015, 808030, 1050439, 1616060, 2100878, 4201756, 5252195, 10504390, 21008780]

約数ペア:

[(1, 21008780), (2, 10504390), (4, 5252195), (5, 4201756), (10, 2100878), (13, 1616060), (20, 1050439), (26, 808030), (52, 404015), (65, 323212), (130, 161606), (260, 80803)]