20485537168 has 20 divisors (see below), whose sum is σ = 40658796108. Its totient is φ = 9992944640.

The previous prime is 20485537151. The next prime is 20485537187. The reversal of 20485537168 is 86173558402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12322776064 + 8162761104 = 111008^2 + 90348^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15613321 + ... + 15614632.

Almost surely, 2^20485537168 is an apocalyptic number.

It is an amenable number.

20485537168 is a deficient number, since it is larger than the sum of its proper divisors (20173258940).

20485537168 is a wasteful number, since it uses less digits than its factorization.

20485537168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31228002 (or 31227996 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 20485537168 in words is "twenty billion, four hundred eighty-five million, five hundred thirty-seven thousand, one hundred sixty-eight".