20502556 has 6 divisors (see below), whose sum is σ = 35879480. Its totient is φ = 10251276.

The previous prime is 20502553. The next prime is 20502569. The reversal of 20502556 is 65520502.

It is a self number, because there is not a number n which added to its sum of digits gives 20502556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2562816 + ... + 2562823.

Almost surely, 2^20502556 is an apocalyptic number.

It is an amenable number.

20502556 is a deficient number, since it is larger than the sum of its proper divisors (15376924).

20502556 is a wasteful number, since it uses less digits than its factorization.

20502556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125643 (or 5125641 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20502556 is about 4527.9748232516. The cubic root of 20502556 is about 273.6965578905.

The spelling of 20502556 in words is "twenty million, five hundred two thousand, five hundred fifty-six".