20700663 has 4 divisors (see below), whose sum is σ = 27600888. Its totient is φ = 13800440.

The previous prime is 20700643. The next prime is 20700677. The reversal of 20700663 is 36600702.

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 20700663 - 2¹⁰ = 20699639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3450108 + ... + 3450113.

It is an arithmetic number, because the mean of its divisors is an integer number (6900222).

Almost surely, 2^20700663 is an apocalyptic number.

20700663 is a deficient number, since it is larger than the sum of its proper divisors (6900225).

20700663 is an equidigital number, since it uses as much as digits as its factorization.

20700663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900224.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20700663 is about 4549.7981273898. The cubic root of 20700663 is about 274.5752694209.

The spelling of 20700663 in words is "twenty million, seven hundred thousand, six hundred sixty-three".