20506766637 has 16 divisors (see below), whose sum is σ = 31252636800. Its totient is φ = 11716565952.

The previous prime is 20506766617. The next prime is 20506766639. The reversal of 20506766637 is 73666760502.

It is a happy number.

It is not a de Polignac number, because 20506766637 - 2⁷ = 20506766509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506766639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102739 + ... + 227087.

It is an arithmetic number, because the mean of its divisors is an integer number (1953289800).

Almost surely, 2^20506766637 is an apocalyptic number.

It is an amenable number.

20506766637 is a deficient number, since it is larger than the sum of its proper divisors (10745870163).

20506766637 is a wasteful number, since it uses less digits than its factorization.

20506766637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132212.

The product of its (nonzero) digits is 1905120, while the sum is 48.

The spelling of 20506766637 in words is "twenty billion, five hundred six million, seven hundred sixty-six thousand, six hundred thirty-seven".