20613642808 has 32 divisors (see below), whose sum is σ = 44644523760. Its totient is φ = 8818670080.

The previous prime is 20613642733. The next prime is 20613642823. The reversal of 20613642808 is 80824631602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6888091 + ... + 6891082.

Almost surely, 2^20613642808 is an apocalyptic number.

It is an amenable number.

20613642808 is an abundant number, since it is smaller than the sum of its proper divisors (24030880952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20613642808 is a wasteful number, since it uses less digits than its factorization.

20613642808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13779207 (or 13779203 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 20613642808 in words is "twenty billion, six hundred thirteen million, six hundred forty-two thousand, eight hundred eight".