20475149 has 2 divisors, whose sum is σ = 20475150. Its totient is φ = 20475148.

The previous prime is 20475121. The next prime is 20475151. The reversal of 20475149 is 94157402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 3541924 = 4115^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 20475149 - 2²⁴ = 3697933 is a prime.

Together with 20475151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20475349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237574 + 10237575.

It is an arithmetic number, because the mean of its divisors is an integer number (10237575).

Almost surely, 2^20475149 is an apocalyptic number.

It is an amenable number.

20475149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20475149 is an equidigital number, since it uses as much as digits as its factorization.

20475149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20475149 is about 4524.9474030092. The cubic root of 20475149 is about 273.5745479570.

The spelling of 20475149 in words is "twenty million, four hundred seventy-five thousand, one hundred forty-nine".