20212663 has 4 divisors (see below), whose sum is σ = 20594088. Its totient is φ = 19831240.

The previous prime is 20212639. The next prime is 20212667. The reversal of 20212663 is 36621202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20212663 - 2⁹ = 20212151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212667) 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, 190633 + ... + 190738.

It is an arithmetic number, because the mean of its divisors is an integer number (5148522).

Almost surely, 2^20212663 is an apocalyptic number.

20212663 is a deficient number, since it is larger than the sum of its proper divisors (381425).

20212663 is an equidigital number, since it uses as much as digits as its factorization.

20212663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381424.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20212663 is about 4495.8495304002. The cubic root of 20212663 is about 272.4004652892.

Adding to 20212663 its reverse (36621202), we get a palindrome (56833865).

The spelling of 20212663 in words is "twenty million, two hundred twelve thousand, six hundred sixty-three".