20424576677 has 4 divisors (see below), whose sum is σ = 20504049996. Its totient is φ = 20345103360.

The previous prime is 20424576673. The next prime is 20424576707. The reversal of 20424576677 is 77667542402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77667542402 = 2 ⋅38833771201.

It can be written as a sum of positive squares in 2 ways, for example, as 17721200641 + 2703376036 = 133121^2 + 51994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424576677 - 2² = 20424576673 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 (20424576673) 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, 39736274 + ... + 39736787.

It is an arithmetic number, because the mean of its divisors is an integer number (5126012499).

Almost surely, 2^20424576677 is an apocalyptic number.

It is an amenable number.

20424576677 is a deficient number, since it is larger than the sum of its proper divisors (79473319).

20424576677 is an equidigital number, since it uses as much as digits as its factorization.

20424576677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79473318.

The product of its (nonzero) digits is 3951360, while the sum is 50.

The spelling of 20424576677 in words is "twenty billion, four hundred twenty-four million, five hundred seventy-six thousand, six hundred seventy-seven".