20023454136 has 64 divisors (see below), whose sum is σ = 57249158400. Its totient is φ = 5717058048.

The previous prime is 20023454107. The next prime is 20023454137. The reversal of 20023454136 is 63145432002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023454137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208960 + ... + 289328.

It is an arithmetic number, because the mean of its divisors is an integer number (894518100).

Almost surely, 2^20023454136 is an apocalyptic number.

It is an amenable number.

20023454136 is an abundant number, since it is smaller than the sum of its proper divisors (37225704264).

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

20023454136 is a wasteful number, since it uses less digits than its factorization.

20023454136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81868 (or 81864 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 20023454136 its reverse (63145432002), we get a palindrome (83168886138).

The spelling of 20023454136 in words is "twenty billion, twenty-three million, four hundred fifty-four thousand, one hundred thirty-six".