20470221679 has 4 divisors (see below), whose sum is σ = 21674352384. Its totient is φ = 19266090976.

The previous prime is 20470221671. The next prime is 20470221701. The reversal of 20470221679 is 97612207402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20470221679 - 2³ = 20470221671 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20470221671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602065327 + ... + 602065360.

It is an arithmetic number, because the mean of its divisors is an integer number (5418588096).

Almost surely, 2^20470221679 is an apocalyptic number.

20470221679 is a deficient number, since it is larger than the sum of its proper divisors (1204130705).

20470221679 is a wasteful number, since it uses less digits than its factorization.

20470221679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204130704.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 20470221679 in words is "twenty billion, four hundred seventy million, two hundred twenty-one thousand, six hundred seventy-nine".