20939234 has 4 divisors (see below), whose sum is σ = 31408854. Its totient is φ = 10469616.

The previous prime is 20939231. The next prime is 20939251. The reversal of 20939234 is 43293902.

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., 15626209 + 5313025 = 3953^2 + 2305^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20939234.

It is not an unprimeable number, because it can be changed into a prime (20939231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5234807 + ... + 5234810.

Almost surely, 2^20939234 is an apocalyptic number.

20939234 is a deficient number, since it is larger than the sum of its proper divisors (10469620).

20939234 is a wasteful number, since it uses less digits than its factorization.

20939234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10469619.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 20939234 is about 4575.9407775888. The cubic root of 20939234 is about 275.6260513669.

The spelling of 20939234 in words is "twenty million, nine hundred thirty-nine thousand, two hundred thirty-four".