20039868677 has 4 divisors (see below), whose sum is σ = 20314387500. Its totient is φ = 19765349856.

The previous prime is 20039868539. The next prime is 20039868679. The reversal of 20039868677 is 77686893002.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4750793476 + 15289075201 = 68926^2 + 123649^2 .

It is a cyclic number.

It is not a de Polignac number, because 20039868677 - 2²⁸ = 19771433221 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 (20039868679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137259302 + ... + 137259447.

It is an arithmetic number, because the mean of its divisors is an integer number (5078596875).

Almost surely, 2^20039868677 is an apocalyptic number.

It is an amenable number.

20039868677 is a deficient number, since it is larger than the sum of its proper divisors (274518823).

20039868677 is an equidigital number, since it uses as much as digits as its factorization.

20039868677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274518822.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 20039868677 in words is "twenty billion, thirty-nine million, eight hundred sixty-eight thousand, six hundred seventy-seven".