20609504 has 12 divisors (see below), whose sum is σ = 40575024. Its totient is φ = 10304736.

The previous prime is 20609489. The next prime is 20609507. The reversal of 20609504 is 40590602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609507) 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, 321992 + ... + 322055.

It is an arithmetic number, because the mean of its divisors is an integer number (3381252).

Almost surely, 2^20609504 is an apocalyptic number.

It is an amenable number.

20609504 is a deficient number, since it is larger than the sum of its proper divisors (19965520).

20609504 is an equidigital number, since it uses as much as digits as its factorization.

20609504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644057 (or 644049 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20609504 is about 4539.7691571268. The cubic root of 20609504 is about 274.1716295555.

The spelling of 20609504 in words is "twenty million, six hundred nine thousand, five hundred four".