20227977787 has 2 divisors, whose sum is σ = 20227977788. Its totient is φ = 20227977786.

The previous prime is 20227977743. The next prime is 20227977793. The reversal of 20227977787 is 78777972202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20227977787 - 2²⁷ = 20093760059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20227977487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10113988893 + 10113988894.

It is an arithmetic number, because the mean of its divisors is an integer number (10113988894).

Almost surely, 2^20227977787 is an apocalyptic number.

20227977787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20227977787 is an equidigital number, since it uses as much as digits as its factorization.

20227977787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9680832, while the sum is 58.

The spelling of 20227977787 in words is "twenty billion, two hundred twenty-seven million, nine hundred seventy-seven thousand, seven hundred eighty-seven".