20771689 has 8 divisors (see below), whose sum is σ = 21636288. Its totient is φ = 19923120.

The previous prime is 20771687. The next prime is 20771713. The reversal of 20771689 is 98617702.

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 20771689 - 2¹ = 20771687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20771683) 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, 1327 + ... + 6580.

It is an arithmetic number, because the mean of its divisors is an integer number (2704536).

Almost surely, 2^20771689 is an apocalyptic number.

It is an amenable number.

20771689 is a deficient number, since it is larger than the sum of its proper divisors (864599).

20771689 is an equidigital number, since it uses as much as digits as its factorization.

20771689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8015.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 20771689 is about 4557.5968448295. The cubic root of 20771689 is about 274.8889424838. Note that the first 3 decimals are identical.

It can be divided in two parts, 2077 and 1689, that multiplied together give a palindrome (3508053).

The spelling of 20771689 in words is "twenty million, seven hundred seventy-one thousand, six hundred eighty-nine".