20689335 has 12 divisors (see below), whose sum is σ = 35861592. Its totient is φ = 11034288.

The previous prime is 20689313. The next prime is 20689343. The reversal of 20689335 is 53398602.

It is not a de Polignac number, because 20689335 - 2¹² = 20685239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20689335.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229837 + ... + 229926.

It is an arithmetic number, because the mean of its divisors is an integer number (2988466).

Almost surely, 2^20689335 is an apocalyptic number.

20689335 is a deficient number, since it is larger than the sum of its proper divisors (15172257).

20689335 is a wasteful number, since it uses less digits than its factorization.

20689335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459774 (or 459771 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20689335 is about 4548.5530666356. The cubic root of 20689335 is about 274.5251751125.

The spelling of 20689335 in words is "twenty million, six hundred eighty-nine thousand, three hundred thirty-five".