20949173 has 4 divisors (see below), whose sum is σ = 23941920. Its totient is φ = 17956428.

The previous prime is 20949167. The next prime is 20949199. The reversal of 20949173 is 37194902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37194902 = 2 ⋅18597451.

It is not a de Polignac number, because 20949173 - 2⁴ = 20949157 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 (20949163) 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, 1496363 + ... + 1496376.

It is an arithmetic number, because the mean of its divisors is an integer number (5985480).

Almost surely, 2^20949173 is an apocalyptic number.

It is an amenable number.

20949173 is a deficient number, since it is larger than the sum of its proper divisors (2992747).

20949173 is an equidigital number, since it uses as much as digits as its factorization.

20949173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992746.

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

The square root of 20949173 is about 4577.0266549366. The cubic root of 20949173 is about 275.6696539489.

The spelling of 20949173 in words is "twenty million, nine hundred forty-nine thousand, one hundred seventy-three".