20427331 has 2 divisors, whose sum is σ = 20427332. Its totient is φ = 20427330.

The previous prime is 20427317. The next prime is 20427347. The reversal of 20427331 is 13372402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20427331 is a prime.

It is a super-2 number, since 2×20427331² = 834551703567122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20427311) 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 as a sum of consecutive naturals, namely, 10213665 + 10213666.

It is an arithmetic number, because the mean of its divisors is an integer number (10213666).

Almost surely, 2^20427331 is an apocalyptic number.

20427331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20427331 is an equidigital number, since it uses as much as digits as its factorization.

20427331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20427331 is about 4519.6604960992. The cubic root of 20427331 is about 273.3614117827.

Adding to 20427331 its reverse (13372402), we get a palindrome (33799733).

It can be divided in two parts, 204273 and 31, that added together give a square (204304 = 452²).

The spelling of 20427331 in words is "twenty million, four hundred twenty-seven thousand, three hundred thirty-one".