20977258567 has 4 divisors (see below), whose sum is σ = 20982792880. Its totient is φ = 20971724256.

The previous prime is 20977258559. The next prime is 20977258633. The reversal of 20977258567 is 76585277902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20977258567 - 2³ = 20977258559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977228567) 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, 2761467 + ... + 2769052.

It is an arithmetic number, because the mean of its divisors is an integer number (5245698220).

Almost surely, 2^20977258567 is an apocalyptic number.

20977258567 is a deficient number, since it is larger than the sum of its proper divisors (5534313).

20977258567 is an equidigital number, since it uses as much as digits as its factorization.

20977258567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534312.

The product of its (nonzero) digits is 14817600, while the sum is 58.

The spelling of 20977258567 in words is "twenty billion, nine hundred seventy-seven million, two hundred fifty-eight thousand, five hundred sixty-seven".