20157716 has 12 divisors (see below), whose sum is σ = 37351188. Its totient is φ = 9485952.

The previous prime is 20157707. The next prime is 20157737. The reversal of 20157716 is 61775102.

It can be written as a sum of positive squares in 2 ways, for example, as 13293316 + 6864400 = 3646^2 + 2620^2 .

It is a congruent number.

It is an unprimeable number.

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, 148151 + ... + 148286.

It is an arithmetic number, because the mean of its divisors is an integer number (3112599).

Almost surely, 2^20157716 is an apocalyptic number.

It is an amenable number.

20157716 is a deficient number, since it is larger than the sum of its proper divisors (17193472).

20157716 is a wasteful number, since it uses less digits than its factorization.

20157716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296458 (or 296456 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 20157716 is about 4489.7345133092. The cubic root of 20157716 is about 272.1534061108.

The spelling of 20157716 in words is "twenty million, one hundred fifty-seven thousand, seven hundred sixteen".