20167062721 has 8 divisors (see below), whose sum is σ = 21724684520. Its totient is φ = 18610342272.

The previous prime is 20167062703. The next prime is 20167062743. The reversal of 20167062721 is 12726076102.

It can be written as a sum of positive squares in 4 ways, for example, as 873852721 + 19293210000 = 29561^2 + 138900^2 .

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 20167062721 - 2⁵ = 20167062689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20167012721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178500 + ... + 268693.

It is an arithmetic number, because the mean of its divisors is an integer number (2715585565).

Almost surely, 2^20167062721 is an apocalyptic number.

It is an amenable number.

20167062721 is a deficient number, since it is larger than the sum of its proper divisors (1557621799).

20167062721 is a wasteful number, since it uses less digits than its factorization.

20167062721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450675.

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 20167062721 in words is "twenty billion, one hundred sixty-seven million, sixty-two thousand, seven hundred twenty-one".