20928238 has 4 divisors (see below), whose sum is σ = 31392360. Its totient is φ = 10464118.

The previous prime is 20928223. The next prime is 20928239. The reversal of 20928238 is 83282902.

It is a happy number.

20928238 is nontrivially palindromic in base 14.

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

It is a super-2 number, since 2×20928238² = 875982291569288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20928239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5232058 + ... + 5232061.

It is an arithmetic number, because the mean of its divisors is an integer number (7848090).

Almost surely, 2^20928238 is an apocalyptic number.

20928238 is a deficient number, since it is larger than the sum of its proper divisors (10464122).

20928238 is a wasteful number, since it uses less digits than its factorization.

20928238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10464121.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20928238 is about 4574.7391182449. The cubic root of 20928238 is about 275.5777956261.

The spelling of 20928238 in words is "twenty million, nine hundred twenty-eight thousand, two hundred thirty-eight".