20500742888953 has 4 divisors (see below), whose sum is σ = 20516549168500. Its totient is φ = 20484936609408.

The previous prime is 20500742888929. The next prime is 20500742889007. The reversal of 20500742888953 is 35988824700502.

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 18778944907024 + 1721797981929 = 4333468^2 + 1312173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20500742888953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20500742888891 and 20500742888900.

It is not an unprimeable number, because it can be changed into a prime (20500742883953) 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, 7903137828 + ... + 7903140421.

It is an arithmetic number, because the mean of its divisors is an integer number (5129137292125).

Almost surely, 2^{20500742888953} is an apocalyptic number.

It is an amenable number.

20500742888953 is a deficient number, since it is larger than the sum of its proper divisors (15806279547).

20500742888953 is a wasteful number, since it uses less digits than its factorization.

20500742888953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15806279546.

The product of its (nonzero) digits is 38707200, while the sum is 61.

The spelling of 20500742888953 in words is "twenty trillion, five hundred billion, seven hundred forty-two million, eight hundred eighty-eight thousand, nine hundred fifty-three".