20145256064 has 32 divisors (see below), whose sum is σ = 40379384640. Its totient is φ = 10010822400.

The previous prime is 20145256049. The next prime is 20145256093. The reversal of 20145256064 is 46065254102.

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

It is an unprimeable number.

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, 461912 + ... + 503639.

It is an arithmetic number, because the mean of its divisors is an integer number (1261855770).

Almost surely, 2^20145256064 is an apocalyptic number.

It is an amenable number.

20145256064 is an abundant number, since it is smaller than the sum of its proper divisors (20234128576).

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

20145256064 is an equidigital number, since it uses as much as digits as its factorization.

20145256064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965728 (or 965716 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 20145256064 in words is "twenty billion, one hundred forty-five million, two hundred fifty-six thousand, sixty-four".