20949079 has 2 divisors, whose sum is σ = 20949080. Its totient is φ = 20949078.

The previous prime is 20949023. The next prime is 20949101. The reversal of 20949079 is 97094902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20949079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20940079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474539 + 10474540.

It is an arithmetic number, because the mean of its divisors is an integer number (10474540).

Almost surely, 2^20949079 is an apocalyptic number.

20949079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20949079 is an equidigital number, since it uses as much as digits as its factorization.

20949079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20949079 is about 4577.0163862499. The cubic root of 20949079 is about 275.6692416337.

The spelling of 20949079 in words is "twenty million, nine hundred forty-nine thousand, seventy-nine".