20021670385 has 8 divisors (see below), whose sum is σ = 24801037056. Its totient is φ = 15500647920.

The previous prime is 20021670379. The next prime is 20021670397. The reversal of 20021670385 is 58307612002.

It is a happy number.

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

It is not a de Polignac number, because 20021670385 - 2³ = 20021670377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021670385.

It is an unprimeable number.

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, 64585879 + ... + 64586188.

It is an arithmetic number, because the mean of its divisors is an integer number (3100129632).

Almost surely, 2^20021670385 is an apocalyptic number.

It is an amenable number.

20021670385 is a deficient number, since it is larger than the sum of its proper divisors (4779366671).

20021670385 is a wasteful number, since it uses less digits than its factorization.

20021670385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129172103.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20021670385 in words is "twenty billion, twenty-one million, six hundred seventy thousand, three hundred eighty-five".