20521974382 has 32 divisors (see below), whose sum is σ = 37929733632. Its totient is φ = 8109366624.

The previous prime is 20521974379. The next prime is 20521974397. The reversal of 20521974382 is 28347912502.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 97873 + ... + 224995.

It is an arithmetic number, because the mean of its divisors is an integer number (1185304176).

Almost surely, 2^20521974382 is an apocalyptic number.

20521974382 is a deficient number, since it is larger than the sum of its proper divisors (17407759250).

20521974382 is a wasteful number, since it uses less digits than its factorization.

20521974382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128032.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20521974382 in words is "twenty billion, five hundred twenty-one million, nine hundred seventy-four thousand, three hundred eighty-two".