20264487 has 4 divisors (see below), whose sum is σ = 27019320. Its totient is φ = 13509656.

The previous prime is 20264479. The next prime is 20264509. The reversal of 20264487 is 78446202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20264487 - 2³ = 20264479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264437) 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 3 ways as a sum of consecutive naturals, for example, 3377412 + ... + 3377417.

It is an arithmetic number, because the mean of its divisors is an integer number (6754830).

Almost surely, 2^20264487 is an apocalyptic number.

20264487 is a deficient number, since it is larger than the sum of its proper divisors (6754833).

20264487 is an equidigital number, since it uses as much as digits as its factorization.

20264487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6754832.

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20264487 is about 4501.6093788777. The cubic root of 20264487 is about 272.6330725073.

The spelling of 20264487 in words is "twenty million, two hundred sixty-four thousand, four hundred eighty-seven".