20090331 has 12 divisors (see below), whose sum is σ = 29694808. Its totient is φ = 13081824.

The previous prime is 20090327. The next prime is 20090333. The reversal of 20090331 is 13309002.

It is not a de Polignac number, because 20090331 - 2² = 20090327 is a prime.

It is a super-2 number, since 2×20090331² = 807242799379122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20090333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25570 + ... + 26343.

Almost surely, 2^20090331 is an apocalyptic number.

20090331 is a deficient number, since it is larger than the sum of its proper divisors (9604477).

20090331 is a wasteful number, since it uses less digits than its factorization.

20090331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51962 (or 51959 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 20090331 is about 4482.2238899903. The cubic root of 20090331 is about 271.8498080502.

Adding to 20090331 its reverse (13309002), we get a palindrome (33399333).

The spelling of 20090331 in words is "twenty million, ninety thousand, three hundred thirty-one".