20363947 has 4 divisors (see below), whose sum is σ = 21249360. Its totient is φ = 19478536.

The previous prime is 20363933. The next prime is 20363957. The reversal of 20363947 is 74936302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20363947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20363927) 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, 442672 + ... + 442717.

It is an arithmetic number, because the mean of its divisors is an integer number (5312340).

Almost surely, 2^20363947 is an apocalyptic number.

20363947 is a deficient number, since it is larger than the sum of its proper divisors (885413).

20363947 is an equidigital number, since it uses as much as digits as its factorization.

20363947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885412.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 20363947 is about 4512.6430171242. The cubic root of 20363947 is about 273.0783809789.

The spelling of 20363947 in words is "twenty million, three hundred sixty-three thousand, nine hundred forty-seven".