20551055552 has 28 divisors (see below), whose sum is σ = 42187246080. Its totient is φ = 9921198336.

The previous prime is 20551055513. The next prime is 20551055573. The reversal of 20551055552 is 25555015502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534528 + ... + 5538239.

It is an arithmetic number, because the mean of its divisors is an integer number (1506687360).

Almost surely, 2^20551055552 is an apocalyptic number.

It is an amenable number.

20551055552 is an abundant number, since it is smaller than the sum of its proper divisors (21636190528).

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

20551055552 is a wasteful number, since it uses less digits than its factorization.

20551055552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11072808 (or 11072798 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 35.

The spelling of 20551055552 in words is "twenty billion, five hundred fifty-one million, fifty-five thousand, five hundred fifty-two".