20461172265 has 48 divisors (see below), whose sum is σ = 37966096896. Its totient is φ = 10560585600.

The previous prime is 20461172261. The next prime is 20461172287. The reversal of 20461172265 is 56227116402.

It is a happy number.

20461172265 is a `hidden beast` number, since 2 + 0 + 461 + 172 + 26 + 5 = 666.

It is not a de Polignac number, because 20461172265 - 2² = 20461172261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20461172261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 233956 + ... + 309285.

It is an arithmetic number, because the mean of its divisors is an integer number (790960352).

Almost surely, 2^20461172265 is an apocalyptic number.

It is an amenable number.

20461172265 is a deficient number, since it is larger than the sum of its proper divisors (17504924631).

20461172265 is an equidigital number, since it uses as much as digits as its factorization.

20461172265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543292 (or 543280 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

Adding to 20461172265 its reverse (56227116402), we get a palindrome (76688288667).

The spelling of 20461172265 in words is "twenty billion, four hundred sixty-one million, one hundred seventy-two thousand, two hundred sixty-five".