20512404068 has 36 divisors (see below), whose sum is σ = 41156915940. Its totient is φ = 8910360576.

The previous prime is 20512404053. The next prime is 20512404071. The reversal of 20512404068 is 86040421502.

It can be written as a sum of positive squares in 6 ways, for example, as 251159104 + 20261244964 = 15848^2 + 142342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 880973 + ... + 903956.

It is an arithmetic number, because the mean of its divisors is an integer number (1143247665).

Almost surely, 2^20512404068 is an apocalyptic number.

It is an amenable number.

20512404068 is an abundant number, since it is smaller than the sum of its proper divisors (20644511872).

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

20512404068 is a wasteful number, since it uses less digits than its factorization.

20512404068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784976 (or 1784961 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The spelling of 20512404068 in words is "twenty billion, five hundred twelve million, four hundred four thousand, sixty-eight".