20868964031 has 4 divisors (see below), whose sum is σ = 20903008632. Its totient is φ = 20834919432.

The previous prime is 20868964019. The next prime is 20868964099. The reversal of 20868964031 is 13046986802.

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 20868964031 - 2¹⁴ = 20868947647 is a prime.

It is a super-2 number, since 2×20868964031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868964531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17021381 + ... + 17022606.

It is an arithmetic number, because the mean of its divisors is an integer number (5225752158).

Almost surely, 2^20868964031 is an apocalyptic number.

20868964031 is a deficient number, since it is larger than the sum of its proper divisors (34044601).

20868964031 is an equidigital number, since it uses as much as digits as its factorization.

20868964031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34044600.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 20868964031 in words is "twenty billion, eight hundred sixty-eight million, nine hundred sixty-four thousand, thirty-one".