20786045 has 24 divisors (see below), whose sum is σ = 29812824. Its totient is φ = 13862016.

The previous prime is 20786041. The next prime is 20786047. The reversal of 20786045 is 54068702.

It can be written as a sum of positive squares in 4 ways, for example, as 3786916 + 16999129 = 1946^2 + 4123^2 .

It is not a de Polignac number, because 20786045 - 2² = 20786041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20786041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7919 + ... + 10211.

It is an arithmetic number, because the mean of its divisors is an integer number (1242201).

Almost surely, 2^20786045 is an apocalyptic number.

It is an amenable number.

20786045 is a deficient number, since it is larger than the sum of its proper divisors (9026779).

20786045 is a wasteful number, since it uses less digits than its factorization.

20786045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349 (or 2342 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20786045 is about 4559.1715256173. The cubic root of 20786045 is about 274.9522561743.

The spelling of 20786045 in words is "twenty million, seven hundred eighty-six thousand, forty-five".