20126243 has 4 divisors (see below), whose sum is σ = 20231808. Its totient is φ = 20020680.

The previous prime is 20126237. The next prime is 20126251. The reversal of 20126243 is 34262102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20126243 - 2⁶ = 20126179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52496 + ... + 52877.

It is an arithmetic number, because the mean of its divisors is an integer number (5057952).

Almost surely, 2^20126243 is an apocalyptic number.

20126243 is a deficient number, since it is larger than the sum of its proper divisors (105565).

20126243 is a wasteful number, since it uses less digits than its factorization.

20126243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105564.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20126243 is about 4486.2281484561. The cubic root of 20126243 is about 272.0116912146.

Adding to 20126243 its reverse (34262102), we get a palindrome (54388345).

The spelling of 20126243 in words is "twenty million, one hundred twenty-six thousand, two hundred forty-three".