20042179 has 4 divisors (see below), whose sum is σ = 20341384. Its totient is φ = 19742976.

The previous prime is 20042173. The next prime is 20042249. The reversal of 20042179 is 97124002.

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 20042179 - 2⁷ = 20042051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042173) 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, 149502 + ... + 149635.

It is an arithmetic number, because the mean of its divisors is an integer number (5085346).

Almost surely, 2^20042179 is an apocalyptic number.

20042179 is a deficient number, since it is larger than the sum of its proper divisors (299205).

20042179 is an equidigital number, since it uses as much as digits as its factorization.

20042179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299204.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20042179 is about 4476.8492268559. The cubic root of 20042179 is about 271.6324467083.

The spelling of 20042179 in words is "twenty million, forty-two thousand, one hundred seventy-nine".