20388605 has 8 divisors (see below), whose sum is σ = 24490752. Its totient is φ = 16294608.

The previous prime is 20388583. The next prime is 20388727. The reversal of 20388605 is 50688302.

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

It is a cyclic number.

It is not a de Polignac number, because 20388605 - 2²⁰ = 19340029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7772 + ... + 10058.

It is an arithmetic number, because the mean of its divisors is an integer number (3061344).

Almost surely, 2^20388605 is an apocalyptic number.

It is an amenable number.

20388605 is a deficient number, since it is larger than the sum of its proper divisors (4102147).

20388605 is a wasteful number, since it uses less digits than its factorization.

20388605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20388605 is about 4515.3742923483. The cubic root of 20388605 is about 273.1885569143.

The spelling of 20388605 in words is "twenty million, three hundred eighty-eight thousand, six hundred five".