20431654243 has 16 divisors (see below), whose sum is σ = 27432711936. Its totient is φ = 14696094240.

The previous prime is 20431654241. The next prime is 20431654253. The reversal of 20431654243 is 34245613402.

It is a cyclic number.

It is not a de Polignac number, because 20431654243 - 2¹ = 20431654241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20431654199 and 20431654208.

It is not an unprimeable number, because it can be changed into a prime (20431654241) 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, 10204621 + ... + 10206622.

It is an arithmetic number, because the mean of its divisors is an integer number (1714544496).

Almost surely, 2^20431654243 is an apocalyptic number.

20431654243 is a deficient number, since it is larger than the sum of its proper divisors (7001057693).

20431654243 is a wasteful number, since it uses less digits than its factorization.

20431654243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20411274.

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 20431654243 in words is "twenty billion, four hundred thirty-one million, six hundred fifty-four thousand, two hundred forty-three".