20555442051 has 16 divisors (see below), whose sum is σ = 27956812800. Its totient is φ = 13431382848.

The previous prime is 20555442041. The next prime is 20555442113. The reversal of 20555442051 is 15024455502.

It is not a de Polignac number, because 20555442051 - 2⁹ = 20555441539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555442041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284071 + ... + 349008.

It is an arithmetic number, because the mean of its divisors is an integer number (1747300800).

Almost surely, 2^20555442051 is an apocalyptic number.

20555442051 is a deficient number, since it is larger than the sum of its proper divisors (7401370749).

20555442051 is a wasteful number, since it uses less digits than its factorization.

20555442051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633298.

The product of its (nonzero) digits is 40000, while the sum is 33.

Adding to 20555442051 its reverse (15024455502), we get a palindrome (35579897553).

The spelling of 20555442051 in words is "twenty billion, five hundred fifty-five million, four hundred forty-two thousand, fifty-one".