20855182812 has 12 divisors (see below), whose sum is σ = 48662093256. Its totient is φ = 6951727600.

The previous prime is 20855182807. The next prime is 20855182813. The reversal of 20855182812 is 21828155802.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855182813) 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, 868965939 + ... + 868965962.

It is an arithmetic number, because the mean of its divisors is an integer number (4055174438).

Almost surely, 2^20855182812 is an apocalyptic number.

It is an amenable number.

20855182812 is an abundant number, since it is smaller than the sum of its proper divisors (27806910444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20855182812 is a wasteful number, since it uses less digits than its factorization.

20855182812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737931908 (or 1737931906 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 42.

The spelling of 20855182812 in words is "twenty billion, eight hundred fifty-five million, one hundred eighty-two thousand, eight hundred twelve".