20431577031 has 8 divisors (see below), whose sum is σ = 28181485680. Its totient is φ = 13151359872.

The previous prime is 20431577029. The next prime is 20431577039. The reversal of 20431577031 is 13077513402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20431577031 - 2¹ = 20431577029 is a prime.

It is a super-2 number, since 2×20431577031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20431576983 and 20431577001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431577039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117422770 + ... + 117422943.

It is an arithmetic number, because the mean of its divisors is an integer number (3522685710).

Almost surely, 2^20431577031 is an apocalyptic number.

20431577031 is a deficient number, since it is larger than the sum of its proper divisors (7749908649).

20431577031 is a wasteful number, since it uses less digits than its factorization.

20431577031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234845745.

The product of its (nonzero) digits is 17640, while the sum is 33.

The spelling of 20431577031 in words is "twenty billion, four hundred thirty-one million, five hundred seventy-seven thousand, thirty-one".