20396290 has 8 divisors (see below), whose sum is σ = 36713340. Its totient is φ = 8158512.

The previous prime is 20396281. The next prime is 20396297. The reversal of 20396290 is 9269302.

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 531441 = 4457^2 + 729^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20396297) 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 3 ways as a sum of consecutive naturals, for example, 1019805 + ... + 1019824.

Almost surely, 2^20396290 is an apocalyptic number.

20396290 is a deficient number, since it is larger than the sum of its proper divisors (16317050).

20396290 is a wasteful number, since it uses less digits than its factorization.

20396290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039636.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20396290 is about 4516.2251936767. The cubic root of 20396290 is about 273.2228765802. Note that the first 3 decimals are identical.

The spelling of 20396290 in words is "twenty million, three hundred ninety-six thousand, two hundred ninety".