20431242164 has 12 divisors (see below), whose sum is σ = 35756892864. Its totient is φ = 10214987064.

The previous prime is 20431242163. The next prime is 20431242233. The reversal of 20431242164 is 46124213402.

It is a super-2 number, since 2×20431242164² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431242163) 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, 81884 + ... + 218099.

It is an arithmetic number, because the mean of its divisors is an integer number (2979741072).

Almost surely, 2^20431242164 is an apocalyptic number.

It is an amenable number.

20431242164 is a deficient number, since it is larger than the sum of its proper divisors (15325650700).

20431242164 is a wasteful number, since it uses less digits than its factorization.

20431242164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317014 (or 317012 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 20431242164 its reverse (46124213402), we get a palindrome (66555455566).

The spelling of 20431242164 in words is "twenty billion, four hundred thirty-one million, two hundred forty-two thousand, one hundred sixty-four".