20005423156 has 6 divisors (see below), whose sum is σ = 35009490530. Its totient is φ = 10002711576.

The previous prime is 20005423153. The next prime is 20005423213. The reversal of 20005423156 is 65132450002.

It can be written as a sum of positive squares in only one way, i.e., 18428062500 + 1577360656 = 135750^2 + 39716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005423153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500677891 + ... + 2500677898.

Almost surely, 2^20005423156 is an apocalyptic number.

It is an amenable number.

20005423156 is a deficient number, since it is larger than the sum of its proper divisors (15004067374).

20005423156 is a wasteful number, since it uses less digits than its factorization.

20005423156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5001355793 (or 5001355791 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20005423156 its reverse (65132450002), we get a palindrome (85137873158).

The spelling of 20005423156 in words is "twenty billion, five million, four hundred twenty-three thousand, one hundred fifty-six".