20994959 has 2 divisors, whose sum is σ = 20994960. Its totient is φ = 20994958.

The previous prime is 20994937. The next prime is 20994979. The reversal of 20994959 is 95949902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20994959 - 2⁸ = 20994703 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20994979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10497479 + 10497480.

It is an arithmetic number, because the mean of its divisors is an integer number (10497480).

Almost surely, 2^20994959 is an apocalyptic number.

20994959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20994959 is an equidigital number, since it uses as much as digits as its factorization.

20994959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 20994959 is about 4582.0256437519. The cubic root of 20994959 is about 275.8703400988.

The spelling of 20994959 in words is "twenty million, nine hundred ninety-four thousand, nine hundred fifty-nine".