20274187 has 4 divisors (see below), whose sum is σ = 20822176. Its totient is φ = 19726200.

The previous prime is 20274179. The next prime is 20274203. The reversal of 20274187 is 78147202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20274187 - 2³ = 20274179 is a prime.

It is a super-2 number, since 2×20274187² = 822085317021938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20274127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273939 + ... + 274012.

It is an arithmetic number, because the mean of its divisors is an integer number (5205544).

Almost surely, 2^20274187 is an apocalyptic number.

20274187 is a deficient number, since it is larger than the sum of its proper divisors (547989).

20274187 is an equidigital number, since it uses as much as digits as its factorization.

20274187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547988.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20274187 is about 4502.6866424392. The cubic root of 20274187 is about 272.6765659837.

The spelling of 20274187 in words is "twenty million, two hundred seventy-four thousand, one hundred eighty-seven".