20640230384 has 10 divisors (see below), whose sum is σ = 39990446400. Its totient is φ = 10320115184.

The previous prime is 20640230363. The next prime is 20640230411. The reversal of 20640230384 is 48303204602.

It is a super-2 number, since 2×20640230384² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20640230384.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 645007184 + ... + 645007215.

It is an arithmetic number, because the mean of its divisors is an integer number (3999044640).

Almost surely, 2^20640230384 is an apocalyptic number.

It is an amenable number.

20640230384 is a deficient number, since it is larger than the sum of its proper divisors (19350216016).

20640230384 is a wasteful number, since it uses less digits than its factorization.

20640230384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290014407 (or 1290014401 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 20640230384 its reverse (48303204602), we get a palindrome (68943434986).

The spelling of 20640230384 in words is "twenty billion, six hundred forty million, two hundred thirty thousand, three hundred eighty-four".