20039021668531 has 4 divisors (see below), whose sum is σ = 20039042343712. Its totient is φ = 20039000993352.

The previous prime is 20039021668529. The next prime is 20039021668537. The reversal of 20039021668531 is 13586612093002.

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

It is a cyclic number.

It is not a de Polignac number, because 20039021668531 - 2¹ = 20039021668529 is a prime.

It is a super-2 number, since 2×20039021668531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20039021668537) 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, 8808336 + ... + 10847341.

It is an arithmetic number, because the mean of its divisors is an integer number (5009760585928).

Almost surely, 2^{20039021668531} is an apocalyptic number.

20039021668531 is a deficient number, since it is larger than the sum of its proper divisors (20675181).

20039021668531 is a wasteful number, since it uses less digits than its factorization.

20039021668531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20675180.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 20039021668531 in words is "twenty trillion, thirty-nine billion, twenty-one million, six hundred sixty-eight thousand, five hundred thirty-one".