20102504 has 8 divisors (see below), whose sum is σ = 37692210. Its totient is φ = 10051248.

The previous prime is 20102503. The next prime is 20102527. The reversal of 20102504 is 40520102.

It can be written as a sum of positive squares in only one way, i.e., 16826404 + 3276100 = 4102^2 + 1810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20102504² = 808221334140032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20102503) 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, 1256399 + ... + 1256414.

Almost surely, 2^20102504 is an apocalyptic number.

It is an amenable number.

20102504 is a deficient number, since it is larger than the sum of its proper divisors (17589706).

20102504 is a wasteful number, since it uses less digits than its factorization.

20102504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512819 (or 2512815 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20102504 is about 4483.5816040304. The cubic root of 20102504 is about 271.9047027750.

Adding to 20102504 its reverse (40520102), we get a palindrome (60622606).

The spelling of 20102504 in words is "twenty million, one hundred two thousand, five hundred four".