20819180285 has 16 divisors (see below), whose sum is σ = 25622231040. Its totient is φ = 16230149760.

The previous prime is 20819180281. The next prime is 20819180287. The reversal of 20819180285 is 58208191802.

It is not a de Polignac number, because 20819180285 - 2² = 20819180281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20819180281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118076 + ... + 235754.

It is an arithmetic number, because the mean of its divisors is an integer number (1601389440).

Almost surely, 2^20819180285 is an apocalyptic number.

It is an amenable number.

20819180285 is a deficient number, since it is larger than the sum of its proper divisors (4803050755).

20819180285 is a wasteful number, since it uses less digits than its factorization.

20819180285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118588.

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 20819180285 in words is "twenty billion, eight hundred nineteen million, one hundred eighty thousand, two hundred eighty-five".