20678737 has 2 divisors, whose sum is σ = 20678738. Its totient is φ = 20678736.

The previous prime is 20678699. The next prime is 20678741. The reversal of 20678737 is 73787602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14508481 + 6170256 = 3809^2 + 2484^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678737 - 2²³ = 12290129 is a prime.

It is a super-2 number, since 2×20678737² = 855220327830338, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20678737.

It is not a weakly prime, because it can be changed into another prime (20670737) 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 as a sum of consecutive naturals, namely, 10339368 + 10339369.

It is an arithmetic number, because the mean of its divisors is an integer number (10339369).

Almost surely, 2^20678737 is an apocalyptic number.

It is an amenable number.

20678737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678737 is an equidigital number, since it uses as much as digits as its factorization.

20678737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 20678737 is about 4547.3879315493. The cubic root of 20678737 is about 274.4782924275.

The spelling of 20678737 in words is "twenty million, six hundred seventy-eight thousand, seven hundred thirty-seven".