20023539 has 16 divisors (see below), whose sum is σ = 27536544. Its totient is φ = 12934400.

The previous prime is 20023537. The next prime is 20023561. The reversal of 20023539 is 93532002.

It is a cyclic number.

It is not a de Polignac number, because 20023539 - 2¹ = 20023537 is a prime.

It is a super-2 number, since 2×20023539² = 801884228169042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20023537) 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, 20809 + ... + 21749.

It is an arithmetic number, because the mean of its divisors is an integer number (1721034).

Almost surely, 2^20023539 is an apocalyptic number.

20023539 is a deficient number, since it is larger than the sum of its proper divisors (7513005).

20023539 is a wasteful number, since it uses less digits than its factorization.

20023539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 20023539 is about 4474.7669213044. The cubic root of 20023539 is about 271.5482110357.

The spelling of 20023539 in words is "twenty million, twenty-three thousand, five hundred thirty-nine".