20683739 has 8 divisors (see below), whose sum is σ = 21795072. Its totient is φ = 19590120.

The previous prime is 20683717. The next prime is 20683763. The reversal of 20683739 is 93738602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20683739 - 2⁸ = 20683483 is a prime.

It is a Duffinian number.

20683739 is a modest number, since divided by 83739 gives 206 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20683709) 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 7 ways as a sum of consecutive naturals, for example, 1997 + ... + 6734.

It is an arithmetic number, because the mean of its divisors is an integer number (2724384).

Almost surely, 2^20683739 is an apocalyptic number.

20683739 is a deficient number, since it is larger than the sum of its proper divisors (1111333).

20683739 is a wasteful number, since it uses less digits than its factorization.

20683739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8857.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20683739 is about 4547.9378843603. The cubic root of 20683739 is about 274.5004219179.

The spelling of 20683739 in words is "twenty million, six hundred eighty-three thousand, seven hundred thirty-nine".