20247765461 has 24 divisors (see below), whose sum is σ = 26144549184. Its totient is φ = 15233379840.

The previous prime is 20247765457. The next prime is 20247765469. The reversal of 20247765461 is 16456774202.

It is a happy number.

It is not a de Polignac number, because 20247765461 - 2² = 20247765457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247765469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91580 + ... + 221093.

It is an arithmetic number, because the mean of its divisors is an integer number (1089356216).

Almost surely, 2^20247765461 is an apocalyptic number.

It is an amenable number.

20247765461 is a deficient number, since it is larger than the sum of its proper divisors (5896783723).

20247765461 is a wasteful number, since it uses less digits than its factorization.

20247765461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312749 (or 312720 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 20247765461 in words is "twenty billion, two hundred forty-seven million, seven hundred sixty-five thousand, four hundred sixty-one".