20078289173 has 4 divisors (see below), whose sum is σ = 20231558688. Its totient is φ = 19925019660.

The previous prime is 20078289169. The next prime is 20078289181. The reversal of 20078289173 is 37198287002.

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 20078289173 - 2² = 20078289169 is a prime.

It is a super-2 number, since 2×20078289173² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078229173) 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, 76634561 + ... + 76634822.

It is an arithmetic number, because the mean of its divisors is an integer number (5057889672).

Almost surely, 2^20078289173 is an apocalyptic number.

It is an amenable number.

20078289173 is a deficient number, since it is larger than the sum of its proper divisors (153269515).

20078289173 is a wasteful number, since it uses less digits than its factorization.

20078289173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153269514.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 20078289173 in words is "twenty billion, seventy-eight million, two hundred eighty-nine thousand, one hundred seventy-three".