20431123350 has 96 divisors (see below), whose sum is σ = 55823212800. Its totient is φ = 4903920000.

The previous prime is 20431123343. The next prime is 20431123369. The reversal of 20431123350 is 5332113402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431123350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105351 + ... + 227949.

It is an arithmetic number, because the mean of its divisors is an integer number (581491800).

Almost surely, 2^20431123350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431123350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27911606400).

20431123350 is an abundant number, since it is smaller than the sum of its proper divisors (35392089450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431123350 is a wasteful number, since it uses less digits than its factorization.

20431123350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122726 (or 122721 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 20431123350 its reverse (5332113402), we get a palindrome (25763236752).

The spelling of 20431123350 in words is "twenty billion, four hundred thirty-one million, one hundred twenty-three thousand, three hundred fifty".