20932987 has 2 divisors, whose sum is σ = 20932988. Its totient is φ = 20932986.

The previous prime is 20932981. The next prime is 20932991. The reversal of 20932987 is 78923902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20932987 - 2¹⁹ = 20408699 is a prime.

It is not a weakly prime, because it can be changed into another prime (20932981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10466493 + 10466494.

It is an arithmetic number, because the mean of its divisors is an integer number (10466494).

Almost surely, 2^20932987 is an apocalyptic number.

20932987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20932987 is an equidigital number, since it uses as much as digits as its factorization.

20932987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 20932987 is about 4575.2581347941. The cubic root of 20932987 is about 275.5986385971.

The spelling of 20932987 in words is "twenty million, nine hundred thirty-two thousand, nine hundred eighty-seven".