20942578787 has 8 divisors (see below), whose sum is σ = 22555134000. Its totient is φ = 19330250400.

The previous prime is 20942578763. The next prime is 20942578807. The reversal of 20942578787 is 78787524902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20942578787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20942578757) 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, 168089 + ... + 264837.

It is an arithmetic number, because the mean of its divisors is an integer number (2819391750).

Almost surely, 2^20942578787 is an apocalyptic number.

20942578787 is a deficient number, since it is larger than the sum of its proper divisors (1612555213).

20942578787 is a wasteful number, since it uses less digits than its factorization.

20942578787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113413.

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 20942578787 in words is "twenty billion, nine hundred forty-two million, five hundred seventy-eight thousand, seven hundred eighty-seven".