20504930 has 8 divisors (see below), whose sum is σ = 36908892. Its totient is φ = 8201968.

The previous prime is 20504923. The next prime is 20504959. The reversal of 20504930 is 3940502.

It can be written as a sum of positive squares in 2 ways, for example, as 16556761 + 3948169 = 4069^2 + 1987^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20504896 and 20504905.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1025237 + ... + 1025256.

Almost surely, 2^20504930 is an apocalyptic number.

20504930 is a deficient number, since it is larger than the sum of its proper divisors (16403962).

20504930 is a wasteful number, since it uses less digits than its factorization.

20504930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050500.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20504930 is about 4528.2369637642. The cubic root of 20504930 is about 273.7071212978.

The spelling of 20504930 in words is "twenty million, five hundred four thousand, nine hundred thirty".