20434568637 has 24 divisors (see below), whose sum is σ = 31705041600. Its totient is φ = 11672988096.

The previous prime is 20434568621. The next prime is 20434568641. The reversal of 20434568637 is 73686543402.

It is not a de Polignac number, because 20434568637 - 2⁴ = 20434568621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434568657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 450064 + ... + 493382.

It is an arithmetic number, because the mean of its divisors is an integer number (1321043400).

Almost surely, 2^20434568637 is an apocalyptic number.

It is an amenable number.

20434568637 is a deficient number, since it is larger than the sum of its proper divisors (11270472963).

20434568637 is a wasteful number, since it uses less digits than its factorization.

20434568637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46545 (or 46538 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 20434568637 in words is "twenty billion, four hundred thirty-four million, five hundred sixty-eight thousand, six hundred thirty-seven".