20638335 has 16 divisors (see below), whose sum is σ = 33080544. Its totient is φ = 10987392.

The previous prime is 20638309. The next prime is 20638339. The reversal of 20638335 is 53383602.

It is not a de Polignac number, because 20638335 - 2¹⁹ = 20114047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11989 + ... + 13601.

It is an arithmetic number, because the mean of its divisors is an integer number (2067534).

Almost surely, 2^20638335 is an apocalyptic number.

20638335 is a deficient number, since it is larger than the sum of its proper divisors (12442209).

20638335 is a wasteful number, since it uses less digits than its factorization.

20638335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 20638335 is about 4542.9434290997. The cubic root of 20638335 is about 274.2994178344.

The spelling of 20638335 in words is "twenty million, six hundred thirty-eight thousand, three hundred thirty-five".