20090848640 has 32 divisors (see below), whose sum is σ = 48029686560. Its totient is φ = 8036339200.

The previous prime is 20090848639. The next prime is 20090848643. The reversal of 20090848640 is 4684809002.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090848643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15695336 + ... + 15696615.

It is an arithmetic number, because the mean of its divisors is an integer number (1500927705).

Almost surely, 2^20090848640 is an apocalyptic number.

20090848640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20090848640 is an abundant number, since it is smaller than the sum of its proper divisors (27938837920).

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

20090848640 is an equidigital number, since it uses as much as digits as its factorization.

20090848640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31391970 (or 31391958 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 20090848640 in words is "twenty billion, ninety million, eight hundred forty-eight thousand, six hundred forty".