20757253653 has 12 divisors (see below), whose sum is σ = 30001355020. Its totient is φ = 13829558976.

The previous prime is 20757253633. The next prime is 20757253661. The reversal of 20757253653 is 35635275702.

20757253653 is a `hidden beast` number, since 20 + 7 + 572 + 5 + 3 + 6 + 53 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13726934244 + 7030319409 = 117162^2 + 83847^2 .

It is not a de Polignac number, because 20757253653 - 2²⁶ = 20690144789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20757253599 and 20757253608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20757253613) 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 11 ways as a sum of consecutive naturals, for example, 702226 + ... + 731187.

Almost surely, 2^20757253653 is an apocalyptic number.

It is an amenable number.

20757253653 is a deficient number, since it is larger than the sum of its proper divisors (9244101367).

20757253653 is a wasteful number, since it uses less digits than its factorization.

20757253653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435028 (or 1435025 counting only the distinct ones).

The product of its (nonzero) digits is 1323000, while the sum is 45.

The spelling of 20757253653 in words is "twenty billion, seven hundred fifty-seven million, two hundred fifty-three thousand, six hundred fifty-three".