20388210320 has 40 divisors (see below), whose sum is σ = 47822102136. Its totient is φ = 8083109888.

The previous prime is 20388210301. The next prime is 20388210329. The reversal of 20388210320 is 2301288302.

It can be written as a sum of positive squares in 4 ways, for example, as 186704896 + 20201505424 = 13664^2 + 142132^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20388210329) 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 7 ways as a sum of consecutive naturals, for example, 1118627 + ... + 1136706.

Almost surely, 2^20388210320 is an apocalyptic number.

20388210320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20388210320 is an abundant number, since it is smaller than the sum of its proper divisors (27433891816).

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

20388210320 is a wasteful number, since it uses less digits than its factorization.

20388210320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255459 (or 2255453 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 20388210320 its reverse (2301288302), we get a palindrome (22689498622).

The spelling of 20388210320 in words is "twenty billion, three hundred eighty-eight million, two hundred ten thousand, three hundred twenty".