20994903 has 8 divisors (see below), whose sum is σ = 31103600. Its totient is φ = 13996584.

The previous prime is 20994901. The next prime is 20994907. The reversal of 20994903 is 30949902.

It is not a de Polignac number, because 20994903 - 2¹ = 20994901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388768 + ... + 388821.

It is an arithmetic number, because the mean of its divisors is an integer number (3887950).

Almost surely, 2^20994903 is an apocalyptic number.

20994903 is a deficient number, since it is larger than the sum of its proper divisors (10108697).

20994903 is an equidigital number, since it uses as much as digits as its factorization.

20994903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777598 (or 777592 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20994903 is about 4582.0195329134. The cubic root of 20994903 is about 275.8700948216.

The spelling of 20994903 in words is "twenty million, nine hundred ninety-four thousand, nine hundred three".