20994759 has 12 divisors (see below), whose sum is σ = 30971616. Its totient is φ = 13698432.

The previous prime is 20994749. The next prime is 20994821. The reversal of 20994759 is 95749902.

It is not a de Polignac number, because 20994759 - 2⁹ = 20994247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24394 + ... + 25239.

It is an arithmetic number, because the mean of its divisors is an integer number (2580968).

Almost surely, 2^20994759 is an apocalyptic number.

20994759 is a deficient number, since it is larger than the sum of its proper divisors (9976857).

20994759 is a wasteful number, since it uses less digits than its factorization.

20994759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49686 (or 49683 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 20994759 is about 4582.0038192913. The cubic root of 20994759 is about 275.8694641069.

The spelling of 20994759 in words is "twenty million, nine hundred ninety-four thousand, seven hundred fifty-nine".