20734904461 has 4 divisors (see below), whose sum is σ = 20735464672. Its totient is φ = 20734344252.

The previous prime is 20734904417. The next prime is 20734904513. The reversal of 20734904461 is 16440943702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20734904461 - 2¹⁵ = 20734871693 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 (20734904161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220335 + ... + 300028.

It is an arithmetic number, because the mean of its divisors is an integer number (5183866168).

Almost surely, 2^20734904461 is an apocalyptic number.

It is an amenable number.

20734904461 is a deficient number, since it is larger than the sum of its proper divisors (560211).

20734904461 is an equidigital number, since it uses as much as digits as its factorization.

20734904461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560210.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 20734904461 in words is "twenty billion, seven hundred thirty-four million, nine hundred four thousand, four hundred sixty-one".