20963623 has 4 divisors (see below), whose sum is σ = 20989800. Its totient is φ = 20937448.

The previous prime is 20963597. The next prime is 20963633. The reversal of 20963623 is 32636902.

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-20963623 is a prime.

It is a super-2 number, since 2×20963623² = 878946978572258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20963633) 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, 11848 + ... + 13501.

It is an arithmetic number, because the mean of its divisors is an integer number (5247450).

Almost surely, 2^20963623 is an apocalyptic number.

20963623 is a deficient number, since it is larger than the sum of its proper divisors (26177).

20963623 is an equidigital number, since it uses as much as digits as its factorization.

20963623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26176.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 20963623 is about 4578.6049185314. The cubic root of 20963623 is about 275.7330217801.

The spelling of 20963623 in words is "twenty million, nine hundred sixty-three thousand, six hundred twenty-three".