20090394 has 12 divisors (see below), whose sum is σ = 43529226. Its totient is φ = 6696792.

The previous prime is 20090393. The next prime is 20090401. The reversal of 20090394 is 49309002.

It can be written as a sum of positive squares in only one way, i.e., 17114769 + 2975625 = 4137^2 + 1725^2 .

It is not an unprimeable number, because it can be changed into a prime (20090393) 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 in 5 ways as a sum of consecutive naturals, for example, 558049 + ... + 558084.

Almost surely, 2^20090394 is an apocalyptic number.

20090394 is an abundant number, since it is smaller than the sum of its proper divisors (23438832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20090394 is a wasteful number, since it uses less digits than its factorization.

20090394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116141 (or 1116138 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20090394 is about 4482.2309177462. The cubic root of 20090394 is about 271.8500922088.

Adding to 20090394 its reverse (49309002), we get a palindrome (69399396).

The spelling of 20090394 in words is "twenty million, ninety thousand, three hundred ninety-four".