20555502051 has 32 divisors (see below), whose sum is σ = 33127628800. Its totient is φ = 11075006880.

The previous prime is 20555502047. The next prime is 20555502073. The reversal of 20555502051 is 15020555502.

It is not a de Polignac number, because 20555502051 - 2² = 20555502047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555502251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37891 + ... + 206268.

It is an arithmetic number, because the mean of its divisors is an integer number (1035238400).

Almost surely, 2^20555502051 is an apocalyptic number.

20555502051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20555502051 is a deficient number, since it is larger than the sum of its proper divisors (12572126749).

20555502051 is a wasteful number, since it uses less digits than its factorization.

20555502051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244399.

The product of its (nonzero) digits is 12500, while the sum is 30.

The spelling of 20555502051 in words is "twenty billion, five hundred fifty-five million, five hundred two thousand, fifty-one".