20513087753 has 4 divisors (see below), whose sum is σ = 20617215300. Its totient is φ = 20408960208.

The previous prime is 20513087729. The next prime is 20513087801. The reversal of 20513087753 is 35778031502.

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 19480622329 + 1032465424 = 139573^2 + 32132^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513087753 - 2¹⁰ = 20513086729 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 20513087753.

It is not an unprimeable number, because it can be changed into a prime (20513087053) 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, 52063478 + ... + 52063871.

It is an arithmetic number, because the mean of its divisors is an integer number (5154303825).

Almost surely, 2^20513087753 is an apocalyptic number.

It is an amenable number.

20513087753 is a deficient number, since it is larger than the sum of its proper divisors (104127547).

20513087753 is a wasteful number, since it uses less digits than its factorization.

20513087753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104127546.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 20513087753 in words is "twenty billion, five hundred thirteen million, eighty-seven thousand, seven hundred fifty-three".