20644025850 has 288 divisors, whose sum is σ = 66410928000. Its totient is φ = 4701715200.

The previous prime is 20644025839. The next prime is 20644025881. The reversal of 20644025850 is 5852044602.

It is a happy number.

20644025850 is a `hidden beast` number, since 2 + 0 + 644 + 0 + 2 + 5 + 8 + 5 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 34463851 + ... + 34464449.

It is an arithmetic number, because the mean of its divisors is an integer number (230593500).

Almost surely, 2^20644025850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20644025850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33205464000).

20644025850 is an abundant number, since it is smaller than the sum of its proper divisors (45766902150).

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

20644025850 is a wasteful number, since it uses less digits than its factorization.

20644025850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1137 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 20644025850 in words is "twenty billion, six hundred forty-four million, twenty-five thousand, eight hundred fifty".