20107688540477 has 4 divisors (see below), whose sum is σ = 20140277987676. Its totient is φ = 20075099093280.

The previous prime is 20107688540431. The next prime is 20107688540507. The reversal of 20107688540477 is 77404588670102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 874999351396 + 19232689189081 = 935414^2 + 4385509^2 .

It is a cyclic number.

It is not a de Polignac number, because 20107688540477 - 2⁸ = 20107688540221 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 (20107688540377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16294722674 + ... + 16294723907.

It is an arithmetic number, because the mean of its divisors is an integer number (5035069496919).

Almost surely, 2^{20107688540477} is an apocalyptic number.

It is an amenable number.

20107688540477 is a deficient number, since it is larger than the sum of its proper divisors (32589447199).

20107688540477 is an equidigital number, since it uses as much as digits as its factorization.

20107688540477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32589447198.

The product of its (nonzero) digits is 21073920, while the sum is 59.

The spelling of 20107688540477 in words is "twenty trillion, one hundred seven billion, six hundred eighty-eight million, five hundred forty thousand, four hundred seventy-seven".