20857715078 has 8 divisors (see below), whose sum is σ = 32049659880. Its totient is φ = 10174495120.

The previous prime is 20857715077. The next prime is 20857715093. The reversal of 20857715078 is 87051775802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857715077) 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, 127181108 + ... + 127181271.

It is an arithmetic number, because the mean of its divisors is an integer number (4006207485).

Almost surely, 2^20857715078 is an apocalyptic number.

20857715078 is a deficient number, since it is larger than the sum of its proper divisors (11191944802).

20857715078 is a wasteful number, since it uses less digits than its factorization.

20857715078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254362422.

The product of its (nonzero) digits is 1097600, while the sum is 50.

The spelling of 20857715078 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, seventy-eight".