20219663 has 4 divisors (see below), whose sum is σ = 20280000. Its totient is φ = 20159328.

The previous prime is 20219653. The next prime is 20219669. The reversal of 20219663 is 36691202.

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-20219663 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 (20219669) 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, 29663 + ... + 30336.

It is an arithmetic number, because the mean of its divisors is an integer number (5070000).

Almost surely, 2^20219663 is an apocalyptic number.

20219663 is a deficient number, since it is larger than the sum of its proper divisors (60337).

20219663 is an equidigital number, since it uses as much as digits as its factorization.

20219663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60336.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20219663 is about 4496.6279588154. The cubic root of 20219663 is about 272.4319073474.

The spelling of 20219663 in words is "twenty million, two hundred nineteen thousand, six hundred sixty-three".