20942179 has 4 divisors (see below), whose sum is σ = 20951784. Its totient is φ = 20932576.

The previous prime is 20942149. The next prime is 20942183. The reversal of 20942179 is 97124902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20942179 - 2¹¹ = 20940131 is a prime.

It is a super-2 number, since 2×20942179² = 877149722536082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20942149) 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, 219 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (5237946).

Almost surely, 2^20942179 is an apocalyptic number.

20942179 is a deficient number, since it is larger than the sum of its proper divisors (9605).

20942179 is an equidigital number, since it uses as much as digits as its factorization.

20942179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9604.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20942179 is about 4576.2625580270. The cubic root of 20942179 is about 275.6389725761.

The spelling of 20942179 in words is "twenty million, nine hundred forty-two thousand, one hundred seventy-nine".