20645168 has 20 divisors (see below), whose sum is σ = 41739888. Its totient is φ = 9873600.

The previous prime is 20645161. The next prime is 20645197. The reversal of 20645168 is 86154602.

It is a super-3 number, since 3×20645168³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20645161) 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, 27683 + ... + 28418.

Almost surely, 2^20645168 is an apocalyptic number.

It is an amenable number.

20645168 is an abundant number, since it is smaller than the sum of its proper divisors (21094720).

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

20645168 is a wasteful number, since it uses less digits than its factorization.

20645168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56132 (or 56126 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20645168 is about 4543.6954123268. The cubic root of 20645168 is about 274.3296864439.

The spelling of 20645168 in words is "twenty million, six hundred forty-five thousand, one hundred sixty-eight".