20179662677 has 8 divisors (see below), whose sum is σ = 21490211736. Its totient is φ = 18882836992.

The previous prime is 20179662661. The next prime is 20179662721. The reversal of 20179662677 is 77626697102.

It can be written as a sum of positive squares in 4 ways, for example, as 9810110116 + 10369552561 = 99046^2 + 101831^2 .

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 20179662677 - 2⁴ = 20179662661 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 (20179662617) 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, 3427808 + ... + 3433689.

It is an arithmetic number, because the mean of its divisors is an integer number (2686276467).

Almost surely, 2^20179662677 is an apocalyptic number.

It is an amenable number.

20179662677 is a deficient number, since it is larger than the sum of its proper divisors (1310549059).

20179662677 is a wasteful number, since it uses less digits than its factorization.

20179662677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6861687.

The product of its (nonzero) digits is 2667168, while the sum is 53.

The spelling of 20179662677 in words is "twenty billion, one hundred seventy-nine million, six hundred sixty-two thousand, six hundred seventy-seven".