20710945 has 16 divisors (see below), whose sum is σ = 26288640. Its totient is φ = 15638400.

The previous prime is 20710927. The next prime is 20710957. The reversal of 20710945 is 54901702.

It is a happy number.

It is not a de Polignac number, because 20710945 - 2⁹ = 20710433 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4726 + ... + 7984.

It is an arithmetic number, because the mean of its divisors is an integer number (1643040).

Almost surely, 2^20710945 is an apocalyptic number.

It is an amenable number.

20710945 is a deficient number, since it is larger than the sum of its proper divisors (5577695).

20710945 is a wasteful number, since it uses less digits than its factorization.

20710945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20710945 is about 4550.9279273572. The cubic root of 20710945 is about 274.6207223230.

The spelling of 20710945 in words is "twenty million, seven hundred ten thousand, nine hundred forty-five".