20178834645 has 16 divisors (see below), whose sum is σ = 32288184000. Its totient is φ = 10761362304.

The previous prime is 20178834601. The next prime is 20178834649. The reversal of 20178834645 is 54643887102.

It is not a de Polignac number, because 20178834645 - 2⁶ = 20178834581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20178834594 and 20178834603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20178834649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280606 + ... + 345104.

It is an arithmetic number, because the mean of its divisors is an integer number (2018011500).

Almost surely, 2^20178834645 is an apocalyptic number.

It is an amenable number.

20178834645 is a deficient number, since it is larger than the sum of its proper divisors (12109349355).

20178834645 is a wasteful number, since it uses less digits than its factorization.

20178834645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85364.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 20178834645 in words is "twenty billion, one hundred seventy-eight million, eight hundred thirty-four thousand, six hundred forty-five".