20547117 has 6 divisors (see below), whose sum is σ = 29679182. Its totient is φ = 13698072.

The previous prime is 20547089. The next prime is 20547139. The reversal of 20547117 is 71174502.

20547117 is a `hidden beast` number, since 2 + 0 + 547 + 117 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17065161 + 3481956 = 4131^2 + 1866^2 .

It is not a de Polignac number, because 20547117 - 2⁶ = 20547053 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 (20547217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1141498 + ... + 1141515.

Almost surely, 2^20547117 is an apocalyptic number.

It is an amenable number.

20547117 is a deficient number, since it is larger than the sum of its proper divisors (9132065).

20547117 is a wasteful number, since it uses less digits than its factorization.

20547117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283019 (or 2283016 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 20547117 is about 4532.8927849664. The cubic root of 20547117 is about 273.8947017558.

The spelling of 20547117 in words is "twenty million, five hundred forty-seven thousand, one hundred seventeen".