20706234631 has 4 divisors (see below), whose sum is σ = 21265862632. Its totient is φ = 20146606632.

The previous prime is 20706234623. The next prime is 20706234649. The reversal of 20706234631 is 13643260702.

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 20706234631 - 2³ = 20706234623 is a prime.

It is a super-2 number, since 2×20706234631² (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 (20706234671) 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, 279813945 + ... + 279814018.

It is an arithmetic number, because the mean of its divisors is an integer number (5316465658).

Almost surely, 2^20706234631 is an apocalyptic number.

20706234631 is a deficient number, since it is larger than the sum of its proper divisors (559628001).

20706234631 is an equidigital number, since it uses as much as digits as its factorization.

20706234631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559628000.

The product of its (nonzero) digits is 36288, while the sum is 34.

The spelling of 20706234631 in words is "twenty billion, seven hundred six million, two hundred thirty-four thousand, six hundred thirty-one".