20539042 has 4 divisors (see below), whose sum is σ = 30808566. Its totient is φ = 10269520.

The previous prime is 20539031. The next prime is 20539049. The reversal of 20539042 is 24093502.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 2468041 = 4251^2 + 1571^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20538998 and 20539016.

It is not an unprimeable number, because it can be changed into a prime (20539049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5134759 + ... + 5134762.

Almost surely, 2^20539042 is an apocalyptic number.

20539042 is a deficient number, since it is larger than the sum of its proper divisors (10269524).

20539042 is a wasteful number, since it uses less digits than its factorization.

20539042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10269523.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20539042 is about 4532.0019858778. The cubic root of 20539042 is about 273.8588169240.

The spelling of 20539042 in words is "twenty million, five hundred thirty-nine thousand, forty-two".