20606057 has 4 divisors (see below), whose sum is σ = 21818196. Its totient is φ = 19393920.

The previous prime is 20606017. The next prime is 20606063. The reversal of 20606057 is 75060602.

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 10896601 + 9709456 = 3301^2 + 3116^2 .

It is a cyclic number.

It is not a de Polignac number, because 20606057 - 2⁶ = 20605993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606017) 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, 606044 + ... + 606077.

It is an arithmetic number, because the mean of its divisors is an integer number (5454549).

Almost surely, 2^20606057 is an apocalyptic number.

It is an amenable number.

20606057 is a deficient number, since it is larger than the sum of its proper divisors (1212139).

20606057 is a wasteful number, since it uses less digits than its factorization.

20606057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212138.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20606057 is about 4539.3894963971. The cubic root of 20606057 is about 274.1563433668.

Adding to 20606057 its reverse (75060602), we get a palindrome (95666659).

The spelling of 20606057 in words is "twenty million, six hundred six thousand, fifty-seven".