20178807497 has 8 divisors (see below), whose sum is σ = 20437088640. Its totient is φ = 19920597840.

The previous prime is 20178807487. The next prime is 20178807553. The reversal of 20178807497 is 79470887102.

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 20178807497 - 2¹⁸ = 20178545353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20178807457) 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, 771047 + ... + 796787.

It is an arithmetic number, because the mean of its divisors is an integer number (2554636080).

Almost surely, 2^20178807497 is an apocalyptic number.

It is an amenable number.

20178807497 is a deficient number, since it is larger than the sum of its proper divisors (258281143).

20178807497 is an equidigital number, since it uses as much as digits as its factorization.

20178807497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35743.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The spelling of 20178807497 in words is "twenty billion, one hundred seventy-eight million, eight hundred seven thousand, four hundred ninety-seven".