20516431044 has 12 divisors (see below), whose sum is σ = 47871672464. Its totient is φ = 6838810344.

The previous prime is 20516431003. The next prime is 20516431087. The reversal of 20516431044 is 44013461502.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 854851282 + ... + 854851305.

Almost surely, 2^20516431044 is an apocalyptic number.

It is an amenable number.

20516431044 is an abundant number, since it is smaller than the sum of its proper divisors (27355241420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20516431044 is a wasteful number, since it uses less digits than its factorization.

20516431044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709702594 (or 1709702592 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 20516431044 its reverse (44013461502), we get a palindrome (64529892546).

The spelling of 20516431044 in words is "twenty billion, five hundred sixteen million, four hundred thirty-one thousand, forty-four".