20136394 has 8 divisors (see below), whose sum is σ = 30223908. Its totient is φ = 10061760.

The previous prime is 20136383. The next prime is 20136407. The reversal of 20136394 is 49363102.

It can be written as a sum of positive squares in 2 ways, for example, as 17749369 + 2387025 = 4213^2 + 1545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3474 + ... + 7234.

Almost surely, 2^20136394 is an apocalyptic number.

20136394 is a deficient number, since it is larger than the sum of its proper divisors (10087514).

20136394 is a wasteful number, since it uses less digits than its factorization.

20136394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440.

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

The square root of 20136394 is about 4487.3593571275. The cubic root of 20136394 is about 272.0574147109.

Adding to 20136394 its reverse (49363102), we get a palindrome (69499496).

The spelling of 20136394 in words is "twenty million, one hundred thirty-six thousand, three hundred ninety-four".