20124729 has 6 divisors (see below), whose sum is σ = 29069066. Its totient is φ = 13416480.

The previous prime is 20124661. The next prime is 20124733. The reversal of 20124729 is 92742102.

It can be written as a sum of positive squares in only one way, i.e., 13155129 + 6969600 = 3627^2 + 2640^2 .

It is not a de Polignac number, because 20124729 - 2⁹ = 20124217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20124799) 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 5 ways as a sum of consecutive naturals, for example, 1118032 + ... + 1118049.

Almost surely, 2^20124729 is an apocalyptic number.

It is an amenable number.

20124729 is a deficient number, since it is larger than the sum of its proper divisors (8944337).

20124729 is a wasteful number, since it uses less digits than its factorization.

20124729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236087 (or 2236084 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20124729 is about 4486.0594066508. The cubic root of 20124729 is about 272.0048703352.

The spelling of 20124729 in words is "twenty million, one hundred twenty-four thousand, seven hundred twenty-nine".