20689442 has 16 divisors (see below), whose sum is σ = 34590240. Its totient is φ = 9223488.

The previous prime is 20689439. The next prime is 20689453. The reversal of 20689442 is 24498602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15368 + ... + 16659.

It is an arithmetic number, because the mean of its divisors is an integer number (2161890).

Almost surely, 2^20689442 is an apocalyptic number.

20689442 is a deficient number, since it is larger than the sum of its proper divisors (13900798).

20689442 is a wasteful number, since it uses less digits than its factorization.

20689442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32065.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 20689442 is about 4548.5648286025. The cubic root of 20689442 is about 274.5256483699.

The spelling of 20689442 in words is "twenty million, six hundred eighty-nine thousand, four hundred forty-two".