20689741 has 8 divisors (see below), whose sum is σ = 21600000. Its totient is φ = 19794720.

The previous prime is 20689709. The next prime is 20689763. The reversal of 20689741 is 14798602.

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 20689741 - 2⁵ = 20689709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20689741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991 + ... + 6508.

It is an arithmetic number, because the mean of its divisors is an integer number (2700000).

Almost surely, 2^20689741 is an apocalyptic number.

It is an amenable number.

20689741 is a deficient number, since it is larger than the sum of its proper divisors (910259).

20689741 is an equidigital number, since it uses as much as digits as its factorization.

20689741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20689741 is about 4548.5976959938. The cubic root of 20689741 is about 274.5269708282.

The spelling of 20689741 in words is "twenty million, six hundred eighty-nine thousand, seven hundred forty-one".