20783289 has 8 divisors (see below), whose sum is σ = 27843232. Its totient is φ = 13789440.

The previous prime is 20783267. The next prime is 20783291. The reversal of 20783289 is 98238702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20783289 - 2¹² = 20779193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20783239) 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, 15784 + ... + 17049.

It is an arithmetic number, because the mean of its divisors is an integer number (3480404).

Almost surely, 2^20783289 is an apocalyptic number.

It is an amenable number.

20783289 is a deficient number, since it is larger than the sum of its proper divisors (7059943).

20783289 is a wasteful number, since it uses less digits than its factorization.

20783289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33047.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 20783289 is about 4558.8692677022. The cubic root of 20783289 is about 274.9401037597.

The spelling of 20783289 in words is "twenty million, seven hundred eighty-three thousand, two hundred eighty-nine".