20566418 has 4 divisors (see below), whose sum is σ = 30849630. Its totient is φ = 10283208.

The previous prime is 20566409. The next prime is 20566453. The reversal of 20566418 is 81466502.

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., 19070689 + 1495729 = 4367^2 + 1223^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5141603 + ... + 5141606.

Almost surely, 2^20566418 is an apocalyptic number.

20566418 is a deficient number, since it is larger than the sum of its proper divisors (10283212).

20566418 is a wasteful number, since it uses less digits than its factorization.

20566418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283211.

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

The square root of 20566418 is about 4535.0212788916. The cubic root of 20566418 is about 273.9804362042.

The spelling of 20566418 in words is "twenty million, five hundred sixty-six thousand, four hundred eighteen".