20536571638 has 8 divisors (see below), whose sum is σ = 33605299080. Its totient is φ = 9334805280.

The previous prime is 20536571567. The next prime is 20536571639. The reversal of 20536571638 is 83617563502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536571639) 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 3 ways as a sum of consecutive naturals, for example, 466740243 + ... + 466740286.

It is an arithmetic number, because the mean of its divisors is an integer number (4200662385).

Almost surely, 2^20536571638 is an apocalyptic number.

20536571638 is a deficient number, since it is larger than the sum of its proper divisors (13068727442).

20536571638 is a wasteful number, since it uses less digits than its factorization.

20536571638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933480542.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 20536571638 in words is "twenty billion, five hundred thirty-six million, five hundred seventy-one thousand, six hundred thirty-eight".