20220187187 has 4 divisors (see below), whose sum is σ = 20226185280. Its totient is φ = 20214189096.

The previous prime is 20220187111. The next prime is 20220187189. The reversal of 20220187187 is 78178102202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220187187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20220187187.

It is not an unprimeable number, because it can be changed into a prime (20220187189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2993987 + ... + 3000732.

It is an arithmetic number, because the mean of its divisors is an integer number (5056546320).

Almost surely, 2^20220187187 is an apocalyptic number.

20220187187 is a deficient number, since it is larger than the sum of its proper divisors (5998093).

20220187187 is an equidigital number, since it uses as much as digits as its factorization.

20220187187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5998092.

The product of its (nonzero) digits is 25088, while the sum is 38.

Adding to 20220187187 its reverse (78178102202), we get a palindrome (98398289389).

The spelling of 20220187187 in words is "twenty billion, two hundred twenty million, one hundred eighty-seven thousand, one hundred eighty-seven".