20959745 has 4 divisors (see below), whose sum is σ = 25151700. Its totient is φ = 16767792.

The previous prime is 20959711. The next prime is 20959777. The reversal of 20959745 is 54795902.

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 7091569 + 13868176 = 2663^2 + 3724^2 .

It is a cyclic number.

It is not a de Polignac number, because 20959745 - 2¹⁴ = 20943361 is a prime.

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, 2095970 + ... + 2095979.

It is an arithmetic number, because the mean of its divisors is an integer number (6287925).

Almost surely, 2^20959745 is an apocalyptic number.

It is an amenable number.

20959745 is a deficient number, since it is larger than the sum of its proper divisors (4191955).

20959745 is an equidigital number, since it uses as much as digits as its factorization.

20959745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191954.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 20959745 is about 4578.1814075023. The cubic root of 20959745 is about 275.7160183801.

The spelling of 20959745 in words is "twenty million, nine hundred fifty-nine thousand, seven hundred forty-five".