20320605 has 16 divisors (see below), whose sum is σ = 36125760. Its totient is φ = 10837584.

The previous prime is 20320583. The next prime is 20320609. The reversal of 20320605 is 50602302.

It is not a de Polignac number, because 20320605 - 2⁶ = 20320541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75127 + ... + 75396.

It is an arithmetic number, because the mean of its divisors is an integer number (2257860).

Almost surely, 2^20320605 is an apocalyptic number.

It is an amenable number.

20320605 is a deficient number, since it is larger than the sum of its proper divisors (15805155).

20320605 is a wasteful number, since it uses less digits than its factorization.

20320605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150537 (or 150531 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20320605 is about 4507.8381736704. The cubic root of 20320605 is about 272.8845061521.

Adding to 20320605 its reverse (50602302), we get a palindrome (70922907).

The spelling of 20320605 in words is "twenty million, three hundred twenty thousand, six hundred five".