20179616621 has 8 divisors (see below), whose sum is σ = 20884741920. Its totient is φ = 19475109808.

The previous prime is 20179616593. The next prime is 20179616647. The reversal of 20179616621 is 12661697102.

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 20179616621 - 2⁶ = 20179616557 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 (20179616021) 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, 87731 + ... + 219216.

It is an arithmetic number, because the mean of its divisors is an integer number (2610592740).

Almost surely, 2^20179616621 is an apocalyptic number.

It is an amenable number.

20179616621 is a deficient number, since it is larger than the sum of its proper divisors (705125299).

20179616621 is a wasteful number, since it uses less digits than its factorization.

20179616621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309243.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 20179616621 in words is "twenty billion, one hundred seventy-nine million, six hundred sixteen thousand, six hundred twenty-one".