20121308892 has 36 divisors (see below), whose sum is σ = 50869695240. Its totient is φ = 6706114272.

The previous prime is 20121308887. The next prime is 20121308899. The reversal of 20121308892 is 29880312102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121308899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231058 + ... + 305990.

It is an arithmetic number, because the mean of its divisors is an integer number (1413047090).

Almost surely, 2^20121308892 is an apocalyptic number.

It is an amenable number.

20121308892 is an abundant number, since it is smaller than the sum of its proper divisors (30748386348).

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

20121308892 is a wasteful number, since it uses less digits than its factorization.

20121308892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82402 (or 82397 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 20121308892 in words is "twenty billion, one hundred twenty-one million, three hundred eight thousand, eight hundred ninety-two".