20547171 has 6 divisors (see below), whose sum is σ = 29679260. Its totient is φ = 13698108.

The previous prime is 20547143. The next prime is 20547193. The reversal of 20547171 is 17174502.

It is not a de Polignac number, because 20547171 - 2⁵ = 20547139 is a prime.

It is a super-2 number, since 2×20547171² = 844372472206482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20540171) 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, 1141501 + ... + 1141518.

Almost surely, 2^20547171 is an apocalyptic number.

20547171 is a deficient number, since it is larger than the sum of its proper divisors (9132089).

20547171 is a wasteful number, since it uses less digits than its factorization.

20547171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283025 (or 2283022 counting only the distinct ones).

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

The square root of 20547171 is about 4532.8987414236. The cubic root of 20547171 is about 273.8949416970.

The spelling of 20547171 in words is "twenty million, five hundred forty-seven thousand, one hundred seventy-one".