20057457 has 16 divisors (see below), whose sum is σ = 30632960. Its totient is φ = 11435472.

The previous prime is 20057437. The next prime is 20057459. The reversal of 20057457 is 75475002.

It is not a de Polignac number, because 20057457 - 2¹⁰ = 20056433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20057459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12228 + ... + 13770.

It is an arithmetic number, because the mean of its divisors is an integer number (1914560).

Almost surely, 2^20057457 is an apocalyptic number.

It is an amenable number.

20057457 is a deficient number, since it is larger than the sum of its proper divisors (10575503).

20057457 is a wasteful number, since it uses less digits than its factorization.

20057457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172.

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 20057457 is about 4478.5552357875. Note that the first 3 decimals coincide. The cubic root of 20057457 is about 271.7014502909.

The spelling of 20057457 in words is "twenty million, fifty-seven thousand, four hundred fifty-seven".