20957049 has 12 divisors (see below), whose sum is σ = 31392816. Its totient is φ = 13971204.

The previous prime is 20957033. The next prime is 20957077. The reversal of 20957049 is 94075902.

It is not a de Polignac number, because 20957049 - 2⁴ = 20957033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20957009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42879 + ... + 43364.

It is an arithmetic number, because the mean of its divisors is an integer number (2616068).

Almost surely, 2^20957049 is an apocalyptic number.

It is an amenable number.

20957049 is a deficient number, since it is larger than the sum of its proper divisors (10435767).

20957049 is an frugal number, since it uses more digits than its factorization.

20957049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86258 (or 86246 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20957049 is about 4577.8869579753. The cubic root of 20957049 is about 275.7041963174.

The spelling of 20957049 in words is "twenty million, nine hundred fifty-seven thousand, forty-nine".