20840670877 has 8 divisors (see below), whose sum is σ = 22485292760. Its totient is φ = 19201976640.

The previous prime is 20840670853. The next prime is 20840670899. The reversal of 20840670877 is 77807604802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3772293561 + 17068377316 = 61419^2 + 130646^2 .

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 20840670877 - 2²⁷ = 20706453149 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 20840670877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840670817) 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, 1474602 + ... + 1488667.

It is an arithmetic number, because the mean of its divisors is an integer number (2810661595).

Almost surely, 2^20840670877 is an apocalyptic number.

It is an amenable number.

20840670877 is a deficient number, since it is larger than the sum of its proper divisors (1644621883).

20840670877 is a wasteful number, since it uses less digits than its factorization.

20840670877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963823.

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 20840670877 in words is "twenty billion, eight hundred forty million, six hundred seventy thousand, eight hundred seventy-seven".