20531551056 has 40 divisors (see below), whose sum is σ = 53049027264. Its totient is φ = 6842664960.

The previous prime is 20531551037. The next prime is 20531551057. The reversal of 20531551056 is 65015513502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531551057) 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 7 ways as a sum of consecutive naturals, for example, 269040 + ... + 336816.

Almost surely, 2^20531551056 is an apocalyptic number.

It is an amenable number.

20531551056 is an abundant number, since it is smaller than the sum of its proper divisors (32517476208).

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

20531551056 is a wasteful number, since it uses less digits than its factorization.

20531551056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74099 (or 74093 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 20531551056 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-one thousand, fifty-six".