20787748889 has 8 divisors (see below), whose sum is σ = 20987618400. Its totient is φ = 20587983136.

The previous prime is 20787748879. The next prime is 20787748901. The reversal of 20787748889 is 98884778702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20787748889 - 2⁴ = 20787748873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20787748879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411962 + ... + 459660.

It is an arithmetic number, because the mean of its divisors is an integer number (2623452300).

Almost surely, 2^20787748889 is an apocalyptic number.

It is an amenable number.

20787748889 is a deficient number, since it is larger than the sum of its proper divisors (199869511).

20787748889 is a wasteful number, since it uses less digits than its factorization.

20787748889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51879.

The product of its (nonzero) digits is 101154816, while the sum is 68.

The spelling of 20787748889 in words is "twenty billion, seven hundred eighty-seven million, seven hundred forty-eight thousand, eight hundred eighty-nine".