20568747 has 4 divisors (see below), whose sum is σ = 27425000. Its totient is φ = 13712496.

The previous prime is 20568733. The next prime is 20568761. The reversal of 20568747 is 74786502.

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

It is an interprime number because it is at equal distance from previous prime (20568733) and next prime (20568761).

It is not a de Polignac number, because 20568747 - 2⁴ = 20568731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20568787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3428122 + ... + 3428127.

It is an arithmetic number, because the mean of its divisors is an integer number (6856250).

Almost surely, 2^20568747 is an apocalyptic number.

20568747 is a deficient number, since it is larger than the sum of its proper divisors (6856253).

20568747 is an equidigital number, since it uses as much as digits as its factorization.

20568747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856252.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20568747 is about 4535.2780510130. The cubic root of 20568747 is about 273.9907779232.

The spelling of 20568747 in words is "twenty million, five hundred sixty-eight thousand, seven hundred forty-seven".