20627476817 has 4 divisors (see below), whose sum is σ = 20627965296. Its totient is φ = 20626988340.

The previous prime is 20627476789. The next prime is 20627476819. The reversal of 20627476817 is 71867472602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20627476817 - 2¹⁴ = 20627460433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20627476819) 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, 174203 + ... + 267584.

It is an arithmetic number, because the mean of its divisors is an integer number (5156991324).

Almost surely, 2^20627476817 is an apocalyptic number.

It is an amenable number.

20627476817 is a deficient number, since it is larger than the sum of its proper divisors (488479).

20627476817 is an equidigital number, since it uses as much as digits as its factorization.

20627476817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488478.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 20627476817 in words is "twenty billion, six hundred twenty-seven million, four hundred seventy-six thousand, eight hundred seventeen".