20641623619 has 8 divisors (see below), whose sum is σ = 20671922592. Its totient is φ = 20611348800.

The previous prime is 20641623599. The next prime is 20641623623. The reversal of 20641623619 is 91632614602.

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

It is a cyclic number.

It is not a de Polignac number, because 20641623619 - 2⁷ = 20641623491 is a prime.

It is a super-2 number, since 2×20641623619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20641623649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301594 + ... + 2310544.

It is an arithmetic number, because the mean of its divisors is an integer number (2583990324).

Almost surely, 2^20641623619 is an apocalyptic number.

20641623619 is a deficient number, since it is larger than the sum of its proper divisors (30298973).

20641623619 is a wasteful number, since it uses less digits than its factorization.

20641623619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12077.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 20641623619 in words is "twenty billion, six hundred forty-one million, six hundred twenty-three thousand, six hundred nineteen".