20794945 has 4 divisors (see below), whose sum is σ = 24953940. Its totient is φ = 16635952.

The previous prime is 20794937. The next prime is 20794951. The reversal of 20794945 is 54949702.

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 10342656 + 10452289 = 3216^2 + 3233^2 .

It is a cyclic number.

It is not a de Polignac number, because 20794945 - 2³ = 20794937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20794898 and 20794907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2079490 + ... + 2079499.

It is an arithmetic number, because the mean of its divisors is an integer number (6238485).

Almost surely, 2^20794945 is an apocalyptic number.

It is an amenable number.

20794945 is a deficient number, since it is larger than the sum of its proper divisors (4158995).

20794945 is an equidigital number, since it uses as much as digits as its factorization.

20794945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158994.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20794945 is about 4560.1474756854. The cubic root of 20794945 is about 274.9914928498.

The spelling of 20794945 in words is "twenty million, seven hundred ninety-four thousand, nine hundred forty-five".