20612331 has 6 divisors (see below), whose sum is σ = 29773380. Its totient is φ = 13741548.

The previous prime is 20612269. The next prime is 20612341. The reversal of 20612331 is 13321602.

20612331 is a `hidden beast` number, since 20 + 612 + 3 + 31 = 666.

It is not a de Polignac number, because 20612331 - 2⁷ = 20612203 is a prime.

It is a super-2 number, since 2×20612331² = 849736378507122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20612341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1145121 + ... + 1145138.

It is an arithmetic number, because the mean of its divisors is an integer number (4962230).

Almost surely, 2^20612331 is an apocalyptic number.

20612331 is a deficient number, since it is larger than the sum of its proper divisors (9161049).

20612331 is a wasteful number, since it uses less digits than its factorization.

20612331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290265 (or 2290262 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20612331 is about 4540.0805058941. The cubic root of 20612331 is about 274.1841649981.

Adding to 20612331 its reverse (13321602), we get a palindrome (33933933).

The spelling of 20612331 in words is "twenty million, six hundred twelve thousand, three hundred thirty-one".