20885338031 has 4 divisors (see below), whose sum is σ = 20887926792. Its totient is φ = 20882749272.

The previous prime is 20885338027. The next prime is 20885338037. The reversal of 20885338031 is 13083358802.

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 20885338031 - 2² = 20885338027 is a prime.

It is a super-2 number, since 2×20885338031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20885338031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20885338037) 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, 1282241 + ... + 1298426.

It is an arithmetic number, because the mean of its divisors is an integer number (5221981698).

Almost surely, 2^20885338031 is an apocalyptic number.

20885338031 is a deficient number, since it is larger than the sum of its proper divisors (2588761).

20885338031 is an equidigital number, since it uses as much as digits as its factorization.

20885338031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588760.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 20885338031 in words is "twenty billion, eight hundred eighty-five million, three hundred thirty-eight thousand, thirty-one".