20626057 has 4 divisors (see below), whose sum is σ = 21183556. Its totient is φ = 20068560.

The previous prime is 20626051. The next prime is 20626061. The reversal of 20626057 is 75062602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75062602 = 2 ⋅37531301.

It can be written as a sum of positive squares in 2 ways, for example, as 16232841 + 4393216 = 4029^2 + 2096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20626057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20626051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278694 + ... + 278767.

It is an arithmetic number, because the mean of its divisors is an integer number (5295889).

Almost surely, 2^20626057 is an apocalyptic number.

It is an amenable number.

20626057 is a deficient number, since it is larger than the sum of its proper divisors (557499).

20626057 is an equidigital number, since it uses as much as digits as its factorization.

20626057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557498.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20626057 is about 4541.5919015253. The cubic root of 20626057 is about 274.2450123420.

Adding to 20626057 its reverse (75062602), we get a palindrome (95688659).

The spelling of 20626057 in words is "twenty million, six hundred twenty-six thousand, fifty-seven".