20544623077 has 4 divisors (see below), whose sum is σ = 22412316096. Its totient is φ = 18676930060.

The previous prime is 20544623059. The next prime is 20544623101. The reversal of 20544623077 is 77032644502.

It is a happy number.

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 20544623077 - 2¹⁵ = 20544590309 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 (20544623977) 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, 933846493 + ... + 933846514.

It is an arithmetic number, because the mean of its divisors is an integer number (5603079024).

Almost surely, 2^20544623077 is an apocalyptic number.

It is an amenable number.

20544623077 is a deficient number, since it is larger than the sum of its proper divisors (1867693019).

20544623077 is a wasteful number, since it uses less digits than its factorization.

20544623077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867693018.

The product of its (nonzero) digits is 282240, while the sum is 40.

The spelling of 20544623077 in words is "twenty billion, five hundred forty-four million, six hundred twenty-three thousand, seventy-seven".