20509019852 has 12 divisors (see below), whose sum is σ = 35893171440. Its totient is φ = 10253828016.

The previous prime is 20509019837. The next prime is 20509019857. The reversal of 20509019852 is 25891090502.

It is not an unprimeable number, because it can be changed into a prime (20509019857) by changing a digit.

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, 99527 + ... + 225662.

It is an arithmetic number, because the mean of its divisors is an integer number (2991097620).

Almost surely, 2^20509019852 is an apocalyptic number.

It is an amenable number.

20509019852 is a deficient number, since it is larger than the sum of its proper divisors (15384151588).

20509019852 is a wasteful number, since it uses less digits than its factorization.

20509019852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340960 (or 340958 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 20509019852 in words is "twenty billion, five hundred nine million, nineteen thousand, eight hundred fifty-two".