20174939 has 2 divisors, whose sum is σ = 20174940. Its totient is φ = 20174938.

The previous prime is 20174929. The next prime is 20174951. The reversal of 20174939 is 93947102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20174939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20174899 and 20174908.

It is not a weakly prime, because it can be changed into another prime (20174929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10087469 + 10087470.

It is an arithmetic number, because the mean of its divisors is an integer number (10087470).

Almost surely, 2^20174939 is an apocalyptic number.

20174939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20174939 is an equidigital number, since it uses as much as digits as its factorization.

20174939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20174939 is about 4491.6521459258. The cubic root of 20174939 is about 272.2308944497.

The spelling of 20174939 in words is "twenty million, one hundred seventy-four thousand, nine hundred thirty-nine".