20604995 has 4 divisors (see below), whose sum is σ = 24726000. Its totient is φ = 16483992.

The previous prime is 20604973. The next prime is 20605019. The reversal of 20604995 is 59940602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20604995 - 2⁶ = 20604931 is a prime.

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, 2060495 + ... + 2060504.

It is an arithmetic number, because the mean of its divisors is an integer number (6181500).

Almost surely, 2^20604995 is an apocalyptic number.

20604995 is a deficient number, since it is larger than the sum of its proper divisors (4121005).

20604995 is an equidigital number, since it uses as much as digits as its factorization.

20604995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121004.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 20604995 is about 4539.2725188074. The cubic root of 20604995 is about 274.1516334404.

The spelling of 20604995 in words is "twenty million, six hundred four thousand, nine hundred ninety-five".