20949499 has 2 divisors, whose sum is σ = 20949500. Its totient is φ = 20949498.

The previous prime is 20949421. The next prime is 20949529. The reversal of 20949499 is 99494902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20949499 - 2⁷ = 20949371 is a prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (20949199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474749 + 10474750.

It is an arithmetic number, because the mean of its divisors is an integer number (10474750).

Almost surely, 2^20949499 is an apocalyptic number.

20949499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20949499 is an equidigital number, since it uses as much as digits as its factorization.

20949499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 20949499 is about 4577.0622674375. The cubic root of 20949499 is about 275.6710838835.

The spelling of 20949499 in words is "twenty million, nine hundred forty-nine thousand, four hundred ninety-nine".