20125729 has 8 divisors (see below), whose sum is σ = 22135680. Its totient is φ = 18181776.

The previous prime is 20125723. The next prime is 20125747. The reversal of 20125729 is 92752102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20125729 - 2⁵ = 20125697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20125697 and 20125706.

It is not an unprimeable number, because it can be changed into a prime (20125723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15859 + ... + 17080.

It is an arithmetic number, because the mean of its divisors is an integer number (2766960).

Almost surely, 2^20125729 is an apocalyptic number.

It is an amenable number.

20125729 is a deficient number, since it is larger than the sum of its proper divisors (2009951).

20125729 is a wasteful number, since it uses less digits than its factorization.

20125729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32999.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20125729 is about 4486.1708616592. The cubic root of 20125729 is about 272.0093755779.

The spelling of 20125729 in words is "twenty million, one hundred twenty-five thousand, seven hundred twenty-nine".