20036720185 has 4 divisors (see below), whose sum is σ = 24044064228. Its totient is φ = 16029376144.

The previous prime is 20036720167. The next prime is 20036720239. The reversal of 20036720185 is 58102763002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6666885801 + 13369834384 = 81651^2 + 115628^2 .

It is a cyclic number.

It is not a de Polignac number, because 20036720185 - 2⁷ = 20036720057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20036720185.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003672014 + ... + 2003672023.

It is an arithmetic number, because the mean of its divisors is an integer number (6011016057).

Almost surely, 2^20036720185 is an apocalyptic number.

It is an amenable number.

20036720185 is a deficient number, since it is larger than the sum of its proper divisors (4007344043).

20036720185 is an equidigital number, since it uses as much as digits as its factorization.

20036720185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007344042.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20036720185 in words is "twenty billion, thirty-six million, seven hundred twenty thousand, one hundred eighty-five".