20645610112 has 64 divisors (see below), whose sum is σ = 41428391400. Its totient is φ = 10248192000.

The previous prime is 20645610109. The next prime is 20645610137. The reversal of 20645610112 is 21101654602.

It can be written as a sum of positive squares in 4 ways, for example, as 20444424256 + 201185856 = 142984^2 + 14184^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12369214 + ... + 12370882.

Almost surely, 2^20645610112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20645610112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20714195700).

20645610112 is an abundant number, since it is smaller than the sum of its proper divisors (20782781288).

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

20645610112 is a wasteful number, since it uses less digits than its factorization.

20645610112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325 (or 2313 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 20645610112 in words is "twenty billion, six hundred forty-five million, six hundred ten thousand, one hundred twelve".