20700557699 has 4 divisors (see below), whose sum is σ = 20793385536. Its totient is φ = 20607729864.

The previous prime is 20700557693. The next prime is 20700557711. The reversal of 20700557699 is 99675500702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99675500702 = 2 ⋅49837750351.

It is a cyclic number.

It is not a de Polignac number, because 20700557699 - 2⁸ = 20700557443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20700557693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46413584 + ... + 46414029.

It is an arithmetic number, because the mean of its divisors is an integer number (5198346384).

Almost surely, 2^20700557699 is an apocalyptic number.

20700557699 is a deficient number, since it is larger than the sum of its proper divisors (92827837).

20700557699 is an equidigital number, since it uses as much as digits as its factorization.

20700557699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92827836.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 20700557699 in words is "twenty billion, seven hundred million, five hundred fifty-seven thousand, six hundred ninety-nine".