20640176421 has 16 divisors (see below), whose sum is σ = 27593280000. Its totient is φ = 13723633008.

The previous prime is 20640176419. The next prime is 20640176443. The reversal of 20640176421 is 12467104602.

It is not a de Polignac number, because 20640176421 - 2¹ = 20640176419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640174421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2959080 + ... + 2966046.

It is an arithmetic number, because the mean of its divisors is an integer number (1724580000).

Almost surely, 2^20640176421 is an apocalyptic number.

It is an amenable number.

20640176421 is a deficient number, since it is larger than the sum of its proper divisors (6953103579).

20640176421 is a wasteful number, since it uses less digits than its factorization.

20640176421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9448.

The product of its (nonzero) digits is 16128, while the sum is 33.

The spelling of 20640176421 in words is "twenty billion, six hundred forty million, one hundred seventy-six thousand, four hundred twenty-one".