20002057 has 4 divisors (see below), whose sum is σ = 20037780. Its totient is φ = 19966336.

The previous prime is 20002027. The next prime is 20002061. The reversal of 20002057 is 75020002.

It is a happy number.

20002057 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1157776 + 18844281 = 1076^2 + 4341^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002057 - 2⁷ = 20001929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20002057.

It is not an unprimeable number, because it can be changed into a prime (20002007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17008 + ... + 18145.

It is an arithmetic number, because the mean of its divisors is an integer number (5009445).

Almost surely, 2^20002057 is an apocalyptic number.

It is an amenable number.

20002057 is a deficient number, since it is larger than the sum of its proper divisors (35723).

20002057 is an equidigital number, since it uses as much as digits as its factorization.

20002057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35722.

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 20002057 is about 4472.3659286780. The cubic root of 20002057 is about 271.4510672689.

Adding to 20002057 its reverse (75020002), we get a palindrome (95022059).

The spelling of 20002057 in words is "twenty million, two thousand, fifty-seven".