20431649461 has 12 divisors (see below), whose sum is σ = 21730707648. Its totient is φ = 19206310592.

The previous prime is 20431649431. The next prime is 20431649467. The reversal of 20431649461 is 16494613402.

It is not a de Polignac number, because 20431649461 - 2⁵ = 20431649429 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 (20431649467) 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 11 ways as a sum of consecutive naturals, for example, 196260 + ... + 281746.

It is an arithmetic number, because the mean of its divisors is an integer number (1810892304).

Almost surely, 2^20431649461 is an apocalyptic number.

It is an amenable number.

20431649461 is a deficient number, since it is larger than the sum of its proper divisors (1299058187).

20431649461 is an equidigital number, since it uses as much as digits as its factorization.

20431649461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86348 (or 86331 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 20431649461 in words is "twenty billion, four hundred thirty-one million, six hundred forty-nine thousand, four hundred sixty-one".