20566406 has 16 divisors (see below), whose sum is σ = 35440416. Its totient is φ = 8768256.

The previous prime is 20566391. The next prime is 20566409. The reversal of 20566406 is 60466502.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (2215026).

Almost surely, 2^20566406 is an apocalyptic number.

20566406 is a deficient number, since it is larger than the sum of its proper divisors (14874010).

20566406 is a wasteful number, since it uses less digits than its factorization.

20566406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7663.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20566406 is about 4535.0199558547. The cubic root of 20566406 is about 273.9803829172.

The spelling of 20566406 in words is "twenty million, five hundred sixty-six thousand, four hundred six".