20973499 has 2 divisors, whose sum is σ = 20973500. Its totient is φ = 20973498.

The previous prime is 20973457. The next prime is 20973521. The reversal of 20973499 is 99437902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20973499 - 2⁷ = 20973371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20973299) 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, 10486749 + 10486750.

It is an arithmetic number, because the mean of its divisors is an integer number (10486750).

Almost surely, 2^20973499 is an apocalyptic number.

20973499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973499 is an equidigital number, since it uses as much as digits as its factorization.

20973499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 20973499 is about 4579.6832859926. The cubic root of 20973499 is about 275.7763144211.

The spelling of 20973499 in words is "twenty million, nine hundred seventy-three thousand, four hundred ninety-nine".