20572705 has 16 divisors (see below), whose sum is σ = 25534080. Its totient is φ = 15902208.

The previous prime is 20572697. The next prime is 20572709. The reversal of 20572705 is 50727502.

It is a cyclic number.

It is not a de Polignac number, because 20572705 - 2³ = 20572697 is a prime.

20572705 is a Rhonda number in base 15.

It is not an unprimeable number, because it can be changed into a prime (20572709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21681 + ... + 22609.

It is an arithmetic number, because the mean of its divisors is an integer number (1595880).

Almost surely, 2^20572705 is an apocalyptic number.

It is an amenable number.

20572705 is a deficient number, since it is larger than the sum of its proper divisors (4961375).

20572705 is a wasteful number, since it uses less digits than its factorization.

20572705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 20572705 is about 4535.7143869516. The cubic root of 20572705 is about 274.0083512826.

The spelling of 20572705 in words is "twenty million, five hundred seventy-two thousand, seven hundred five".