21131275

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{1787}}^1$

素因数の和:1851

約数の個数: 24

約数和(自身を含む): 29265984

約数和(自身を除く): 8134709

約数列:

[1, 5, 11, 25, 43, 55, 215, 275, 473, 1075, 1787, 2365, 8935, 11825, 19657, 44675, 76841, 98285, 384205, 491425, 845251, 1921025, 4226255, 21131275]

約数ペア:

[(1, 21131275), (5, 4226255), (11, 1921025), (25, 845251), (43, 491425), (55, 384205), (215, 98285), (275, 76841), (473, 44675), (1075, 19657), (1787, 11825), (2365, 8935)]