20380248725761 has 4 divisors (see below), whose sum is σ = 20381737109332. Its totient is φ = 20378760342192.

The previous prime is 20380248725743. The next prime is 20380248725791. The reversal of 20380248725761 is 16752784208302.

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 11908400231025 + 8471848494736 = 3450855^2 + 2910644^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380248725761 - 2²³ = 20380240337153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20380248725791) 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, 744171246 + ... + 744198631.

It is an arithmetic number, because the mean of its divisors is an integer number (5095434277333).

Almost surely, 2^{20380248725761} is an apocalyptic number.

It is an amenable number.

20380248725761 is a deficient number, since it is larger than the sum of its proper divisors (1488383571).

20380248725761 is a wasteful number, since it uses less digits than its factorization.

20380248725761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488383570.

The product of its (nonzero) digits is 9031680, while the sum is 55.

The spelling of 20380248725761 in words is "twenty trillion, three hundred eighty billion, two hundred forty-eight million, seven hundred twenty-five thousand, seven hundred sixty-one".