20708745 has 16 divisors (see below), whose sum is σ = 33236352. Its totient is φ = 11010560.

The previous prime is 20708741. The next prime is 20708761. The reversal of 20708745 is 54780702.

It is not a de Polignac number, because 20708745 - 2² = 20708741 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20708741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3340 + ... + 7250.

It is an arithmetic number, because the mean of its divisors is an integer number (2077272).

Almost surely, 2^20708745 is an apocalyptic number.

It is an amenable number.

20708745 is a deficient number, since it is larger than the sum of its proper divisors (12527607).

20708745 is a wasteful number, since it uses less digits than its factorization.

20708745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20708745 is about 4550.6862119905. The cubic root of 20708745 is about 274.6109982056.

The spelling of 20708745 in words is "twenty million, seven hundred eight thousand, seven hundred forty-five".