20722831663 has 8 divisors (see below), whose sum is σ = 21645027936. Its totient is φ = 19802402400.

The previous prime is 20722831639. The next prime is 20722831673. The reversal of 20722831663 is 36613822702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20722831663 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 (20722831603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417748 + ... + 464713.

It is an arithmetic number, because the mean of its divisors is an integer number (2705628492).

Almost surely, 2^20722831663 is an apocalyptic number.

20722831663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20722831663 is a deficient number, since it is larger than the sum of its proper divisors (922196273).

20722831663 is a wasteful number, since it uses less digits than its factorization.

20722831663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883505.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 20722831663 in words is "twenty billion, seven hundred twenty-two million, eight hundred thirty-one thousand, six hundred sixty-three".