20639063461 has 8 divisors (see below), whose sum is σ = 20670111000. Its totient is φ = 20608039680.

The previous prime is 20639063413. The next prime is 20639063521. The reversal of 20639063461 is 16436093602.

It can be written as a sum of positive squares in 4 ways, for example, as 10735032100 + 9904031361 = 103610^2 + 99519^2 .

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 20639063461 - 2²⁹ = 20102192549 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 (20639063411) 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 7 ways as a sum of consecutive naturals, for example, 2417881 + ... + 2426401.

It is an arithmetic number, because the mean of its divisors is an integer number (2583763875).

Almost surely, 2^20639063461 is an apocalyptic number.

It is an amenable number.

20639063461 is a deficient number, since it is larger than the sum of its proper divisors (31047539).

20639063461 is a wasteful number, since it uses less digits than its factorization.

20639063461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 20639063461 in words is "twenty billion, six hundred thirty-nine million, sixty-three thousand, four hundred sixty-one".