20325761261 has 16 divisors (see below), whose sum is σ = 22468489008. Its totient is φ = 18271872000.

The previous prime is 20325761249. The next prime is 20325761299. The reversal of 20325761261 is 16216752302.

It can be written as a sum of positive squares in 8 ways, for example, as 323316361 + 20002444900 = 17981^2 + 141430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20325761261 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 (20325761201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46796 + ... + 206981.

It is an arithmetic number, because the mean of its divisors is an integer number (1404280563).

Almost surely, 2^20325761261 is an apocalyptic number.

It is an amenable number.

20325761261 is a deficient number, since it is larger than the sum of its proper divisors (2142727747).

20325761261 is a wasteful number, since it uses less digits than its factorization.

20325761261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253952.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 20325761261 in words is "twenty billion, three hundred twenty-five million, seven hundred sixty-one thousand, two hundred sixty-one".