20949191 has 6 divisors (see below), whose sum is σ = 22110192. Its totient is φ = 19846260.

The previous prime is 20949167. The next prime is 20949199. The reversal of 20949191 is 19194902.

It is not a de Polignac number, because 20949191 - 2¹⁰ = 20948167 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 (20949199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28655 + ... + 29376.

It is an arithmetic number, because the mean of its divisors is an integer number (3685032).

Almost surely, 2^20949191 is an apocalyptic number.

20949191 is a deficient number, since it is larger than the sum of its proper divisors (1161001).

20949191 is an equidigital number, since it uses as much as digits as its factorization.

20949191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58069 (or 58050 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 20949191 is about 4577.0286212782. The cubic root of 20949191 is about 275.6697329028.

The spelling of 20949191 in words is "twenty million, nine hundred forty-nine thousand, one hundred ninety-one".