20831487012 has 252 divisors, whose sum is σ = 65646314496. Its totient is φ = 5758633440.

The previous prime is 20831486987. The next prime is 20831487073. The reversal of 20831487012 is 21078413802.

It is a tau number, because it is divible by the number of its divisors (252).

It is a super-2 number, since 2×20831487012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 4427053 + ... + 4431755.

It is an arithmetic number, because the mean of its divisors is an integer number (260501248).

Almost surely, 2^20831487012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20831487012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32823157248).

20831487012 is an abundant number, since it is smaller than the sum of its proper divisors (44814827484).

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

20831487012 is a wasteful number, since it uses less digits than its factorization.

20831487012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770 (or 4746 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 20831487012 in words is "twenty billion, eight hundred thirty-one million, four hundred eighty-seven thousand, twelve".