20805338 has 4 divisors (see below), whose sum is σ = 31208010. Its totient is φ = 10402668.

The previous prime is 20805329. The next prime is 20805341. The reversal of 20805338 is 83350802.

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

It can be written as a sum of positive squares in only one way, i.e., 19123129 + 1682209 = 4373^2 + 1297^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20805338.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201333 + ... + 5201336.

Almost surely, 2^20805338 is an apocalyptic number.

20805338 is a deficient number, since it is larger than the sum of its proper divisors (10402672).

20805338 is a wasteful number, since it uses less digits than its factorization.

20805338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402671.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20805338 is about 4561.2868798180. The cubic root of 20805338 is about 275.0372974206.

The spelling of 20805338 in words is "twenty million, eight hundred five thousand, three hundred thirty-eight".