20111432320 has 64 divisors (see below), whose sum is σ = 54947318400. Its totient is φ = 6895346688.

The previous prime is 20111432273. The next prime is 20111432357. The reversal of 20111432320 is 2323411102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2240100 + ... + 2249059.

It is an arithmetic number, because the mean of its divisors is an integer number (858551850).

Almost surely, 2^20111432320 is an apocalyptic number.

20111432320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111432320 is an abundant number, since it is smaller than the sum of its proper divisors (34835886080).

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

20111432320 is an equidigital number, since it uses as much as digits as its factorization.

20111432320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489185 (or 4489173 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20111432320 its reverse (2323411102), we get a palindrome (22434843422).

The spelling of 20111432320 in words is "twenty billion, one hundred eleven million, four hundred thirty-two thousand, three hundred twenty".