20789434 has 4 divisors (see below), whose sum is σ = 31184154. Its totient is φ = 10394716.

The previous prime is 20789429. The next prime is 20789441. The reversal of 20789434 is 43498702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12581209 + 8208225 = 3547^2 + 2865^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20789393 and 20789402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5197357 + ... + 5197360.

Almost surely, 2^20789434 is an apocalyptic number.

20789434 is a deficient number, since it is larger than the sum of its proper divisors (10394720).

20789434 is a wasteful number, since it uses less digits than its factorization.

20789434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10394719.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20789434 is about 4559.5431788722. The cubic root of 20789434 is about 274.9671982915.

The spelling of 20789434 in words is "twenty million, seven hundred eighty-nine thousand, four hundred thirty-four".