20539607 has 4 divisors (see below), whose sum is σ = 22406856. Its totient is φ = 18672360.

The previous prime is 20539601. The next prime is 20539609. The reversal of 20539607 is 70693502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20539607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933608 + ... + 933629.

It is an arithmetic number, because the mean of its divisors is an integer number (5601714).

Almost surely, 2^20539607 is an apocalyptic number.

20539607 is a deficient number, since it is larger than the sum of its proper divisors (1867249).

20539607 is a wasteful number, since it uses less digits than its factorization.

20539607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867248.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20539607 is about 4532.0643199319. The cubic root of 20539607 is about 273.8613280573.

The spelling of 20539607 in words is "twenty million, five hundred thirty-nine thousand, six hundred seven".