20031002231 has 4 divisors (see below), whose sum is σ = 20082496200. Its totient is φ = 19979508264.

The previous prime is 20031002227. The next prime is 20031002237. The reversal of 20031002231 is 13220013002.

It is a happy number.

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 20031002231 - 2² = 20031002227 is a prime.

It is a super-2 number, since 2×20031002231² (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 (20031002237) 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, 25746401 + ... + 25747178.

It is an arithmetic number, because the mean of its divisors is an integer number (5020624050).

Almost surely, 2^20031002231 is an apocalyptic number.

20031002231 is a deficient number, since it is larger than the sum of its proper divisors (51493969).

20031002231 is an equidigital number, since it uses as much as digits as its factorization.

20031002231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51493968.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20031002231 its reverse (13220013002), we get a palindrome (33251015233).

The spelling of 20031002231 in words is "twenty billion, thirty-one million, two thousand, two hundred thirty-one".