20500335551 has 24 divisors (see below), whose sum is σ = 23143236480. Its totient is φ = 18074355552.

The previous prime is 20500335523. The next prime is 20500335563. The reversal of 20500335551 is 15553300502.

It is not a de Polignac number, because 20500335551 - 2³⁰ = 19426593727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500335511) 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, 581120 + ... + 615386.

It is an arithmetic number, because the mean of its divisors is an integer number (964301520).

Almost surely, 2^20500335551 is an apocalyptic number.

20500335551 is a deficient number, since it is larger than the sum of its proper divisors (2642900929).

20500335551 is a wasteful number, since it uses less digits than its factorization.

20500335551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34383 (or 34346 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 29.

The spelling of 20500335551 in words is "twenty billion, five hundred million, three hundred thirty-five thousand, five hundred fifty-one".