20566117 has 32 divisors (see below), whose sum is σ = 26046720. Its totient is φ = 16061760.

The previous prime is 20566097. The next prime is 20566121. The reversal of 20566117 is 71166502.

It is not a de Polignac number, because 20566117 - 2¹¹ = 20564069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555823 + ... + 555859.

It is an arithmetic number, because the mean of its divisors is an integer number (813960).

Almost surely, 2^20566117 is an apocalyptic number.

It is an amenable number.

20566117 is a deficient number, since it is larger than the sum of its proper divisors (5480603).

20566117 is a wasteful number, since it uses less digits than its factorization.

20566117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20566117 is about 4534.9880925974. The cubic root of 20566117 is about 273.9790995833.

The spelling of 20566117 in words is "twenty million, five hundred sixty-six thousand, one hundred seventeen".