20331587 has 2 divisors, whose sum is σ = 20331588. Its totient is φ = 20331586.

The previous prime is 20331559. The next prime is 20331601. The reversal of 20331587 is 78513302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20331587 - 2¹² = 20327491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20330587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165793 + 10165794.

It is an arithmetic number, because the mean of its divisors is an integer number (10165794).

Almost surely, 2^20331587 is an apocalyptic number.

20331587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331587 is an equidigital number, since it uses as much as digits as its factorization.

20331587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20331587 is about 4509.0561096531. The cubic root of 20331587 is about 272.9336562299.

Adding to 20331587 its reverse (78513302), we get a palindrome (98844889).

The spelling of 20331587 in words is "twenty million, three hundred thirty-one thousand, five hundred eighty-seven".