20554949 has 2 divisors, whose sum is σ = 20554950. Its totient is φ = 20554948.

The previous prime is 20554907. The next prime is 20554957. The reversal of 20554949 is 94945502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 2856100 = 4207^2 + 1690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20554949 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20554999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277474 + 10277475.

It is an arithmetic number, because the mean of its divisors is an integer number (10277475).

Almost surely, 2^20554949 is an apocalyptic number.

It is an amenable number.

20554949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554949 is an equidigital number, since it uses as much as digits as its factorization.

20554949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 20554949 is about 4533.7566101413. The cubic root of 20554949 is about 273.9294977292.

The spelling of 20554949 in words is "twenty million, five hundred fifty-four thousand, nine hundred forty-nine".