20787027457 has 8 divisors (see below), whose sum is σ = 25154050176. Its totient is φ = 16769366592.

The previous prime is 20787027403. The next prime is 20787027529. The reversal of 20787027457 is 75472078702.

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 20787027457 - 2⁷ = 20787027329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20787027457.

It is not an unprimeable number, because it can be changed into a prime (20787027257) 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, 87340333 + ... + 87340570.

It is an arithmetic number, because the mean of its divisors is an integer number (3144256272).

Almost surely, 2^20787027457 is an apocalyptic number.

It is an amenable number.

20787027457 is a deficient number, since it is larger than the sum of its proper divisors (4367022719).

20787027457 is a wasteful number, since it uses less digits than its factorization.

20787027457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174680927.

The product of its (nonzero) digits is 1536640, while the sum is 49.

The spelling of 20787027457 in words is "twenty billion, seven hundred eighty-seven million, twenty-seven thousand, four hundred fifty-seven".