20805058 has 4 divisors (see below), whose sum is σ = 31207590. Its totient is φ = 10402528.

The previous prime is 20805049. The next prime is 20805089. The reversal of 20805058 is 85050802.

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., 20766249 + 38809 = 4557^2 + 197^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201263 + ... + 5201266.

Almost surely, 2^20805058 is an apocalyptic number.

20805058 is a deficient number, since it is larger than the sum of its proper divisors (10402532).

20805058 is a wasteful number, since it uses less digits than its factorization.

20805058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402531.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 20805058 is about 4561.2561866223. The cubic root of 20805058 is about 275.0360635900.

The spelling of 20805058 in words is "twenty million, eight hundred five thousand, fifty-eight".