20567799077 has 4 divisors (see below), whose sum is σ = 23506056096. Its totient is φ = 17629542060.

The previous prime is 20567799071. The next prime is 20567799089. The reversal of 20567799077 is 77099776502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20567799077 - 2¹⁸ = 20567536933 is a prime.

It is a super-4 number, since 4×20567799077⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20567799071) 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, 1469128499 + ... + 1469128512.

It is an arithmetic number, because the mean of its divisors is an integer number (5876514024).

Almost surely, 2^20567799077 is an apocalyptic number.

It is an amenable number.

20567799077 is a deficient number, since it is larger than the sum of its proper divisors (2938257019).

20567799077 is an equidigital number, since it uses as much as digits as its factorization.

20567799077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938257018.

The product of its (nonzero) digits is 11668860, while the sum is 59.

The spelling of 20567799077 in words is "twenty billion, five hundred sixty-seven million, seven hundred ninety-nine thousand, seventy-seven".