20553938 has 4 divisors (see below), whose sum is σ = 30830910. Its totient is φ = 10276968.

The previous prime is 20553937. The next prime is 20553941. The reversal of 20553938 is 83935502.

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., 17952169 + 2601769 = 4237^2 + 1613^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20553898 and 20553907.

It is not an unprimeable number, because it can be changed into a prime (20553931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5138483 + ... + 5138486.

Almost surely, 2^20553938 is an apocalyptic number.

20553938 is a deficient number, since it is larger than the sum of its proper divisors (10276972).

20553938 is a wasteful number, since it uses less digits than its factorization.

20553938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276971.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 20553938 is about 4533.6451118278. The cubic root of 20553938 is about 273.9250065599.

The spelling of 20553938 in words is "twenty million, five hundred fifty-three thousand, nine hundred thirty-eight".