20550394 has 4 divisors (see below), whose sum is σ = 30825594. Its totient is φ = 10275196.

The previous prime is 20550391. The next prime is 20550403. The reversal of 20550394 is 49305502.

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., 19918369 + 632025 = 4463^2 + 795^2 .

It is not an unprimeable number, because it can be changed into a prime (20550391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5137597 + ... + 5137600.

Almost surely, 2^20550394 is an apocalyptic number.

20550394 is a deficient number, since it is larger than the sum of its proper divisors (10275200).

20550394 is a wasteful number, since it uses less digits than its factorization.

20550394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10275199.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20550394 is about 4533.2542395061. The cubic root of 20550394 is about 273.9092618719.

Adding to 20550394 its reverse (49305502), we get a palindrome (69855896).

The spelling of 20550394 in words is "twenty million, five hundred fifty thousand, three hundred ninety-four".