20770625861 has 8 divisors (see below), whose sum is σ = 21066326424. Its totient is φ = 20476691200.

The previous prime is 20770625849. The next prime is 20770625881. The reversal of 20770625861 is 16852607702.

It can be written as a sum of positive squares in 4 ways, for example, as 2570997025 + 18199628836 = 50705^2 + 134906^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20770625861 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 (20770625881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417776 + ... + 464841.

It is an arithmetic number, because the mean of its divisors is an integer number (2633290803).

Almost surely, 2^20770625861 is an apocalyptic number.

It is an amenable number.

20770625861 is a deficient number, since it is larger than the sum of its proper divisors (295700563).

20770625861 is a wasteful number, since it uses less digits than its factorization.

20770625861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882951.

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

The spelling of 20770625861 in words is "twenty billion, seven hundred seventy million, six hundred twenty-five thousand, eight hundred sixty-one".