20994901 has 2 divisors, whose sum is σ = 20994902. Its totient is φ = 20994900.

The previous prime is 20994899. The next prime is 20994907. The reversal of 20994901 is 10949902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 3896676 = 4135^2 + 1974^2 .

It is a cyclic number.

It is not a de Polignac number, because 20994901 - 2¹ = 20994899 is a prime.

Together with 20994899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20994907) 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 as a sum of consecutive naturals, namely, 10497450 + 10497451.

It is an arithmetic number, because the mean of its divisors is an integer number (10497451).

Almost surely, 2^20994901 is an apocalyptic number.

It is an amenable number.

20994901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20994901 is an equidigital number, since it uses as much as digits as its factorization.

20994901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 20994901 is about 4582.0193146690. The cubic root of 20994901 is about 275.8700860617.

The spelling of 20994901 in words is "twenty million, nine hundred ninety-four thousand, nine hundred one".