20700312758261 has 4 divisors (see below), whose sum is σ = 20711364715692. Its totient is φ = 20689260800832.

The previous prime is 20700312758227. The next prime is 20700312758263. The reversal of 20700312758261 is 16285721300702.

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 6464738482225 + 14235574276036 = 2542585^2 + 3773006^2 .

It is a cyclic number.

It is not a de Polignac number, because 20700312758261 - 2⁶ = 20700312758197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700312758263) 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, 5525975906 + ... + 5525979651.

It is an arithmetic number, because the mean of its divisors is an integer number (5177841178923).

Almost surely, 2^{20700312758261} is an apocalyptic number.

It is an amenable number.

20700312758261 is a deficient number, since it is larger than the sum of its proper divisors (11051957431).

20700312758261 is a wasteful number, since it uses less digits than its factorization.

20700312758261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051957430.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 20700312758261 in words is "twenty trillion, seven hundred billion, three hundred twelve million, seven hundred fifty-eight thousand, two hundred sixty-one".