20519168 has 18 divisors (see below), whose sum is σ = 40958694. Its totient is φ = 10259456.

The previous prime is 20519167. The next prime is 20519171. The reversal of 20519168 is 86191502.

It can be written as a sum of positive squares in only one way, i.e., 20502784 + 16384 = 4528^2 + 128^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20519167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39821 + ... + 40332.

It is an arithmetic number, because the mean of its divisors is an integer number (2275483).

Almost surely, 2^20519168 is an apocalyptic number.

It is an amenable number.

20519168 is a deficient number, since it is larger than the sum of its proper divisors (20439526).

20519168 is an frugal number, since it uses more digits than its factorization.

20519168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80169 (or 80155 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 20519168 is about 4529.8088259881. The cubic root of 20519168 is about 273.7704579416.

The spelling of 20519168 in words is "twenty million, five hundred nineteen thousand, one hundred sixty-eight".