20502172 has 6 divisors (see below), whose sum is σ = 35878808. Its totient is φ = 10251084.

The previous prime is 20502169. The next prime is 20502179. The reversal of 20502172 is 27120502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2562768 + ... + 2562775.

Almost surely, 2^20502172 is an apocalyptic number.

It is an amenable number.

20502172 is a deficient number, since it is larger than the sum of its proper divisors (15376636).

20502172 is a wasteful number, since it uses less digits than its factorization.

20502172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125547 (or 5125545 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20502172 is about 4527.9324199904. The cubic root of 20502172 is about 273.6948491582.

Adding to 20502172 its reverse (27120502), we get a palindrome (47622674).

The spelling of 20502172 in words is "twenty million, five hundred two thousand, one hundred seventy-two".