20768637 has 4 divisors (see below), whose sum is σ = 27691520. Its totient is φ = 13845756.

The previous prime is 20768617. The next prime is 20768711. The reversal of 20768637 is 73686702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20768637 - 2¹⁶ = 20703101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20768595 and 20768604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20768617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461437 + ... + 3461442.

It is an arithmetic number, because the mean of its divisors is an integer number (6922880).

Almost surely, 2^20768637 is an apocalyptic number.

It is an amenable number.

20768637 is a deficient number, since it is larger than the sum of its proper divisors (6922883).

20768637 is an equidigital number, since it uses as much as digits as its factorization.

20768637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6922882.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 20768637 is about 4557.2620069511. The cubic root of 20768637 is about 274.8754786108.

The spelling of 20768637 in words is "twenty million, seven hundred sixty-eight thousand, six hundred thirty-seven".