20213434231 has 24 divisors (see below), whose sum is σ = 22030172640. Its totient is φ = 18531686400.

The previous prime is 20213434181. The next prime is 20213434249. The reversal of 20213434231 is 13243431202.

It is not a de Polignac number, because 20213434231 - 2¹⁵ = 20213401463 is a prime.

It is a super-2 number, since 2×20213434231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213434196 and 20213434205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213434291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13376766 + ... + 13378276.

It is an arithmetic number, because the mean of its divisors is an integer number (917923860).

Almost surely, 2^20213434231 is an apocalyptic number.

20213434231 is a deficient number, since it is larger than the sum of its proper divisors (1816738409).

20213434231 is a wasteful number, since it uses less digits than its factorization.

20213434231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715 (or 2698 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20213434231 its reverse (13243431202), we get a palindrome (33456865433).

The spelling of 20213434231 in words is "twenty billion, two hundred thirteen million, four hundred thirty-four thousand, two hundred thirty-one".