20031001231 has 16 divisors (see below), whose sum is σ = 20989483200. Its totient is φ = 19079976960.

The previous prime is 20031001163. The next prime is 20031001241. The reversal of 20031001231 is 13210013002.

It is a cyclic number.

It is not a de Polignac number, because 20031001231 - 2⁹ = 20031000719 is a prime.

It is a super-2 number, since 2×20031001231² (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 (20031001241) 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, 9478831 + ... + 9480943.

It is an arithmetic number, because the mean of its divisors is an integer number (1311842700).

Almost surely, 2^20031001231 is an apocalyptic number.

20031001231 is a deficient number, since it is larger than the sum of its proper divisors (958481969).

20031001231 is a wasteful number, since it uses less digits than its factorization.

20031001231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20031001231 its reverse (13210013002), we get a palindrome (33241014233).

The spelling of 20031001231 in words is "twenty billion, thirty-one million, one thousand, two hundred thirty-one".