20502164 has 6 divisors (see below), whose sum is σ = 35878794. Its totient is φ = 10251080.

The previous prime is 20502151. The next prime is 20502169. The reversal of 20502164 is 46120502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18130564 + 2371600 = 4258^2 + 1540^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2562767 + ... + 2562774.

It is an arithmetic number, because the mean of its divisors is an integer number (5979799).

Almost surely, 2^20502164 is an apocalyptic number.

It is an amenable number.

20502164 is a deficient number, since it is larger than the sum of its proper divisors (15376630).

20502164 is a wasteful number, since it uses less digits than its factorization.

20502164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125545 (or 5125543 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20502164 is about 4527.9315365849. The cubic root of 20502164 is about 273.6948135594.

Adding to 20502164 its reverse (46120502), we get a palindrome (66622666).

The spelling of 20502164 in words is "twenty million, five hundred two thousand, one hundred sixty-four".