20669235 has 16 divisors (see below), whose sum is σ = 33137664. Its totient is φ = 11001312.

The previous prime is 20669227. The next prime is 20669239. The reversal of 20669235 is 53296602.

20669235 is a nontrivial binomial coefficient, being equal to C(6430, 2).

It is not a de Polignac number, because 20669235 - 2³ = 20669227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20669196 and 20669205.

It is not an unprimeable number, because it can be changed into a prime (20669239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8574 + ... + 10716.

It is an arithmetic number, because the mean of its divisors is an integer number (2071104).

Almost surely, 2^20669235 is an apocalyptic number.

20669235 is the 6429-th triangular number and also the 3215-th hexagonal number.

20669235 is a deficient number, since it is larger than the sum of its proper divisors (12468429).

20669235 is a wasteful number, since it uses less digits than its factorization.

20669235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 20669235 is about 4546.3430358916. The cubic root of 20669235 is about 274.4362445288.

The spelling of 20669235 in words is "twenty million, six hundred sixty-nine thousand, two hundred thirty-five".