20753859845 has 16 divisors (see below), whose sum is σ = 26428388400. Its totient is φ = 15591604224.

The previous prime is 20753859827. The next prime is 20753859851. The reversal of 20753859845 is 54895835702.

It is a happy number.

It is a Cunningham number, because it is equal to 144062²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 485497156 + 20268362689 = 22034^2 + 142367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20753859845 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233732 + ... + 310061.

It is an arithmetic number, because the mean of its divisors is an integer number (1651774275).

Almost surely, 2^20753859845 is an apocalyptic number.

It is an amenable number.

20753859845 is a deficient number, since it is larger than the sum of its proper divisors (5674528555).

20753859845 is a wasteful number, since it uses less digits than its factorization.

20753859845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544264.

The product of its (nonzero) digits is 12096000, while the sum is 56.

The spelling of 20753859845 in words is "twenty billion, seven hundred fifty-three million, eight hundred fifty-nine thousand, eight hundred forty-five".