20394124864 has 21 divisors (see below), whose sum is σ = 40471858731. Its totient is φ = 10196491200.

The previous prime is 20394124859. The next prime is 20394124931. The reversal of 20394124864 is 46842149302.

The square root of 20394124864 is 142808.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20394124864.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1133539 + ... + 1151389.

Almost surely, 2^20394124864 is an apocalyptic number.

20394124864 is the 142808-th square number.

It is an amenable number.

20394124864 is a deficient number, since it is larger than the sum of its proper divisors (20077733867).

20394124864 is an frugal number, since it uses more digits than its factorization.

20394124864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35714 (or 17853 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 20394124864 in words is "twenty billion, three hundred ninety-four million, one hundred twenty-four thousand, eight hundred sixty-four".