20745288853 has 4 divisors (see below), whose sum is σ = 21965599980. Its totient is φ = 19524977728.

The previous prime is 20745288827. The next prime is 20745288901. The reversal of 20745288853 is 35888254702.

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 6532357329 + 14212931524 = 80823^2 + 119218^2 .

It is a cyclic number.

It is not a de Polignac number, because 20745288853 - 2⁵ = 20745288821 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 20745288853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745282853) 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, 610155538 + ... + 610155571.

It is an arithmetic number, because the mean of its divisors is an integer number (5491399995).

Almost surely, 2^20745288853 is an apocalyptic number.

It is an amenable number.

20745288853 is a deficient number, since it is larger than the sum of its proper divisors (1220311127).

20745288853 is a wasteful number, since it uses less digits than its factorization.

20745288853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220311126.

The product of its (nonzero) digits is 4300800, while the sum is 52.

The spelling of 20745288853 in words is "twenty billion, seven hundred forty-five million, two hundred eighty-eight thousand, eight hundred fifty-three".