20530394 has 4 divisors (see below), whose sum is σ = 30795594. Its totient is φ = 10265196.

The previous prime is 20530351. The next prime is 20530397. The reversal of 20530394 is 49303502.

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., 17850625 + 2679769 = 4225^2 + 1637^2 .

It is not an unprimeable number, because it can be changed into a prime (20530397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5132597 + ... + 5132600.

Almost surely, 2^20530394 is an apocalyptic number.

20530394 is a deficient number, since it is larger than the sum of its proper divisors (10265200).

20530394 is a wasteful number, since it uses less digits than its factorization.

20530394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10265199.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20530394 is about 4531.0477816946. The cubic root of 20530394 is about 273.8203752816.

Adding to 20530394 its reverse (49303502), we get a palindrome (69833896).

The spelling of 20530394 in words is "twenty million, five hundred thirty thousand, three hundred ninety-four".