20090057 has 4 divisors (see below), whose sum is σ = 21635460. Its totient is φ = 18544656.

The previous prime is 20090053. The next prime is 20090071. The reversal of 20090057 is 75009002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75009002 = 2 ⋅37504501.

It can be written as a sum of positive squares in 2 ways, for example, as 11703241 + 8386816 = 3421^2 + 2896^2 .

It is not a de Polignac number, because 20090057 - 2² = 20090053 is a prime.

It is a super-2 number, since 2×20090057² = 807220780526498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20090053) 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 3 ways as a sum of consecutive naturals, for example, 772682 + ... + 772707.

It is an arithmetic number, because the mean of its divisors is an integer number (5408865).

Almost surely, 2^20090057 is an apocalyptic number.

It is an amenable number.

20090057 is a deficient number, since it is larger than the sum of its proper divisors (1545403).

20090057 is a wasteful number, since it uses less digits than its factorization.

20090057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545402.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 20090057 is about 4482.1933247016. The cubic root of 20090057 is about 271.8485721790.

Adding to 20090057 its reverse (75009002), we get a palindrome (95099059).

The spelling of 20090057 in words is "twenty million, ninety thousand, fifty-seven".