20613394 has 4 divisors (see below), whose sum is σ = 30920094. Its totient is φ = 10306696.

The previous prime is 20613377. The next prime is 20613407. The reversal of 20613394 is 49331602.

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., 18378369 + 2235025 = 4287^2 + 1495^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153347 + ... + 5153350.

Almost surely, 2^20613394 is an apocalyptic number.

20613394 is a deficient number, since it is larger than the sum of its proper divisors (10306700).

20613394 is a wasteful number, since it uses less digits than its factorization.

20613394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306699.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20613394 is about 4540.1975727935. The cubic root of 20613394 is about 274.1888782408.

Adding to 20613394 its reverse (49331602), we get a palindrome (69944996).

The spelling of 20613394 in words is "twenty million, six hundred thirteen thousand, three hundred ninety-four".