20186939 has 12 divisors (see below), whose sum is σ = 22383984. Its totient is φ = 18167424.

The previous prime is 20186927. The next prime is 20186951. The reversal of 20186939 is 93968102.

It is an interprime number because it is at equal distance from previous prime (20186927) and next prime (20186951).

It is not a de Polignac number, because 20186939 - 2¹² = 20182843 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 (20186339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5129 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (1865332).

Almost surely, 2^20186939 is an apocalyptic number.

20186939 is a deficient number, since it is larger than the sum of its proper divisors (2197045).

20186939 is a wasteful number, since it uses less digits than its factorization.

20186939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094 (or 3077 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 20186939 is about 4492.9877587191. The cubic root of 20186939 is about 272.2848578224.

The spelling of 20186939 in words is "twenty million, one hundred eighty-six thousand, nine hundred thirty-nine".