20299949 has 2 divisors, whose sum is σ = 20299950. Its totient is φ = 20299948.

The previous prime is 20299931. The next prime is 20299957. The reversal of 20299949 is 94999202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 2617924 = 4205^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 20299949 - 2²⁰ = 19251373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20299249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10149974 + 10149975.

It is an arithmetic number, because the mean of its divisors is an integer number (10149975).

Almost surely, 2^20299949 is an apocalyptic number.

It is an amenable number.

20299949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20299949 is an equidigital number, since it uses as much as digits as its factorization.

20299949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 20299949 is about 4505.5464707403. The cubic root of 20299949 is about 272.7920119679.

The spelling of 20299949 in words is "twenty million, two hundred ninety-nine thousand, nine hundred forty-nine".