20464987 has 2 divisors, whose sum is σ = 20464988. Its totient is φ = 20464986.

The previous prime is 20464979. The next prime is 20465041. The reversal of 20464987 is 78946402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20464987 - 2³ = 20464979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20464937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232493 + 10232494.

It is an arithmetic number, because the mean of its divisors is an integer number (10232494).

Almost surely, 2^20464987 is an apocalyptic number.

20464987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464987 is an equidigital number, since it uses as much as digits as its factorization.

20464987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 20464987 is about 4523.8243776698. The cubic root of 20464987 is about 273.5292813005.

The spelling of 20464987 in words is "twenty million, four hundred sixty-four thousand, nine hundred eighty-seven".