20949179 has 4 divisors (see below), whose sum is σ = 20960280. Its totient is φ = 20938080.

The previous prime is 20949167. The next prime is 20949199. The reversal of 20949179 is 97194902.

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 20949179 - 2⁴ = 20949163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20949109) 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, 1934 + ... + 6755.

It is an arithmetic number, because the mean of its divisors is an integer number (5240070).

Almost surely, 2^20949179 is an apocalyptic number.

20949179 is a deficient number, since it is larger than the sum of its proper divisors (11101).

20949179 is an equidigital number, since it uses as much as digits as its factorization.

20949179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 20949179 is about 4577.0273103839. The cubic root of 20949179 is about 275.6696802669.

The spelling of 20949179 in words is "twenty million, nine hundred forty-nine thousand, one hundred seventy-nine".