20725191361 has 6 divisors (see below), whose sum is σ = 24108896130. Its totient is φ = 17764449696.

The previous prime is 20725191287. The next prime is 20725191379. The reversal of 20725191361 is 16319152702.

It can be written as a sum of positive squares in only one way, i.e., 17281731600 + 3443459761 = 131460^2 + 58681^2 .

It is not a de Polignac number, because 20725191361 - 2¹¹ = 20725189313 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 20725191361.

It is not an unprimeable number, because it can be changed into a prime (20725191161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211481496 + ... + 211481593.

It is an arithmetic number, because the mean of its divisors is an integer number (4018149355).

Almost surely, 2^20725191361 is an apocalyptic number.

It is an amenable number.

20725191361 is a deficient number, since it is larger than the sum of its proper divisors (3383704769).

20725191361 is an equidigital number, since it uses as much as digits as its factorization.

20725191361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422963103 (or 422963096 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 20725191361 in words is "twenty billion, seven hundred twenty-five million, one hundred ninety-one thousand, three hundred sixty-one".