20016657 has 6 divisors (see below), whose sum is σ = 28912962. Its totient is φ = 13344432.

The previous prime is 20016649. The next prime is 20016677. The reversal of 20016657 is 75661002.

20016657 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 6 + 657 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17313921 + 2702736 = 4161^2 + 1644^2 .

It is not a de Polignac number, because 20016657 - 2³ = 20016649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20016657.

It is not an unprimeable number, because it can be changed into a prime (20016677) 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 5 ways as a sum of consecutive naturals, for example, 1112028 + ... + 1112045.

It is an arithmetic number, because the mean of its divisors is an integer number (4818827).

Almost surely, 2^20016657 is an apocalyptic number.

It is an amenable number.

20016657 is a deficient number, since it is larger than the sum of its proper divisors (8896305).

20016657 is a wasteful number, since it uses less digits than its factorization.

20016657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224079 (or 2224076 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20016657 is about 4473.9978766200. The cubic root of 20016657 is about 271.5170975059.

Adding to 20016657 its reverse (75661002), we get a palindrome (95677659).

The spelling of 20016657 in words is "twenty million, sixteen thousand, six hundred fifty-seven".