20431020449 has 12 divisors (see below), whose sum is σ = 23807219184. Its totient is φ = 17482445064.

The previous prime is 20431020443. The next prime is 20431020499. The reversal of 20431020449 is 94402013402.

It is not a de Polignac number, because 20431020449 - 2⁴ = 20431020433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20431020443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326399 + ... + 383924.

It is an arithmetic number, because the mean of its divisors is an integer number (1983934932).

Almost surely, 2^20431020449 is an apocalyptic number.

It is an amenable number.

20431020449 is a deficient number, since it is larger than the sum of its proper divisors (3376198735).

20431020449 is an equidigital number, since it uses as much as digits as its factorization.

20431020449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710924 (or 710917 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 20431020449 in words is "twenty billion, four hundred thirty-one million, twenty thousand, four hundred forty-nine".