20639198167 has 16 divisors (see below), whose sum is σ = 24154675200. Its totient is φ = 17270510400.

The previous prime is 20639198137. The next prime is 20639198201. The reversal of 20639198167 is 76189193602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20639198167 - 2¹⁹ = 20638673879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639198137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160459 + ... + 258892.

It is an arithmetic number, because the mean of its divisors is an integer number (1509667200).

Almost surely, 2^20639198167 is an apocalyptic number.

20639198167 is a deficient number, since it is larger than the sum of its proper divisors (3515477033).

20639198167 is an equidigital number, since it uses as much as digits as its factorization.

20639198167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419526.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 20639198167 in words is "twenty billion, six hundred thirty-nine million, one hundred ninety-eight thousand, one hundred sixty-seven".