20689311 has 8 divisors (see below), whose sum is σ = 27730944. Its totient is φ = 13720280.

The previous prime is 20689247. The next prime is 20689313. The reversal of 20689311 is 11398602.

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 20689311 - 2⁶ = 20689247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689313) 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, 17481 + ... + 18626.

It is an arithmetic number, because the mean of its divisors is an integer number (3466368).

Almost surely, 2^20689311 is an apocalyptic number.

20689311 is a deficient number, since it is larger than the sum of its proper divisors (7041633).

20689311 is a wasteful number, since it uses less digits than its factorization.

20689311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36301.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 20689311 is about 4548.5504284332. The cubic root of 20689311 is about 274.5250689611.

The spelling of 20689311 in words is "twenty million, six hundred eighty-nine thousand, three hundred eleven".