20640363 has 8 divisors (see below), whose sum is σ = 29139408. Its totient is φ = 12950784.

The previous prime is 20640331. The next prime is 20640391. The reversal of 20640363 is 36304602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20640363 - 2⁵ = 20640331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20640313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202306 + ... + 202407.

It is an arithmetic number, because the mean of its divisors is an integer number (3642426).

Almost surely, 2^20640363 is an apocalyptic number.

20640363 is a deficient number, since it is larger than the sum of its proper divisors (8499045).

20640363 is a wasteful number, since it uses less digits than its factorization.

20640363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404733.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 20640363 is about 4543.1666269244. The cubic root of 20640363 is about 274.3084021024.

Adding to 20640363 its reverse (36304602), we get a palindrome (56944965).

The spelling of 20640363 in words is "twenty million, six hundred forty thousand, three hundred sixty-three".