20947193 has 4 divisors (see below), whose sum is σ = 21669540. Its totient is φ = 20224848.

The previous prime is 20947189. The next prime is 20947211. The reversal of 20947193 is 39174902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7011904 + 13935289 = 2648^2 + 3733^2 .

It is a cyclic number.

It is not a de Polignac number, because 20947193 - 2² = 20947189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20947133) 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, 361130 + ... + 361187.

It is an arithmetic number, because the mean of its divisors is an integer number (5417385).

Almost surely, 2^20947193 is an apocalyptic number.

It is an amenable number.

20947193 is a deficient number, since it is larger than the sum of its proper divisors (722347).

20947193 is an equidigital number, since it uses as much as digits as its factorization.

20947193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722346.

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

The square root of 20947193 is about 4576.8103521994. The cubic root of 20947193 is about 275.6609687515.

The spelling of 20947193 in words is "twenty million, nine hundred forty-seven thousand, one hundred ninety-three".