20289538 has 4 divisors (see below), whose sum is σ = 30434310. Its totient is φ = 10144768.

The previous prime is 20289527. The next prime is 20289541. The reversal of 20289538 is 83598202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83598202 = 2 ⋅41799101.

It can be written as a sum of positive squares in only one way, i.e., 18207289 + 2082249 = 4267^2 + 1443^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20289497 and 20289506.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5072383 + ... + 5072386.

Almost surely, 2^20289538 is an apocalyptic number.

20289538 is a deficient number, since it is larger than the sum of its proper divisors (10144772).

20289538 is a wasteful number, since it uses less digits than its factorization.

20289538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10144771.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 20289538 is about 4504.3909688214. The cubic root of 20289538 is about 272.7453694322.

The spelling of 20289538 in words is "twenty million, two hundred eighty-nine thousand, five hundred thirty-eight".