20636463 has 4 divisors (see below), whose sum is σ = 27515288. Its totient is φ = 13757640.

The previous prime is 20636461. The next prime is 20636479. The reversal of 20636463 is 36463602.

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

It is not a de Polignac number, because 20636463 - 2¹ = 20636461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20636463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636461) 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, 3439408 + ... + 3439413.

It is an arithmetic number, because the mean of its divisors is an integer number (6878822).

Almost surely, 2^20636463 is an apocalyptic number.

20636463 is a deficient number, since it is larger than the sum of its proper divisors (6878825).

20636463 is an equidigital number, since it uses as much as digits as its factorization.

20636463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6878824.

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 20636463 is about 4542.7373906049. The cubic root of 20636463 is about 274.2911241415.

The spelling of 20636463 in words is "twenty million, six hundred thirty-six thousand, four hundred sixty-three".