20555022187 has 8 divisors (see below), whose sum is σ = 24727846400. Its totient is φ = 16691296104.

The previous prime is 20555022179. The next prime is 20555022193. The reversal of 20555022187 is 78122055502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20555022187 - 2³ = 20555022179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555028187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77274387 + ... + 77274652.

It is an arithmetic number, because the mean of its divisors is an integer number (3090980800).

Almost surely, 2^20555022187 is an apocalyptic number.

20555022187 is a deficient number, since it is larger than the sum of its proper divisors (4172824213).

20555022187 is a wasteful number, since it uses less digits than its factorization.

20555022187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154549065.

The product of its (nonzero) digits is 56000, while the sum is 37.

Adding to 20555022187 its reverse (78122055502), we get a palindrome (98677077689).

The spelling of 20555022187 in words is "twenty billion, five hundred fifty-five million, twenty-two thousand, one hundred eighty-seven".