20344257920 has 64 divisors (see below), whose sum is σ = 55583431200. Its totient is φ = 6975172608.

The previous prime is 20344257907. The next prime is 20344258001. The reversal of 20344257920 is 2975244302.

It is a happy number.

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

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 in 7 ways as a sum of consecutive naturals, for example, 2266085 + ... + 2275044.

Almost surely, 2^20344257920 is an apocalyptic number.

20344257920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20344257920 is an abundant number, since it is smaller than the sum of its proper divisors (35239173280).

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

20344257920 is an equidigital number, since it uses as much as digits as its factorization.

20344257920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541155 (or 4541143 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 20344257920 in words is "twenty billion, three hundred forty-four million, two hundred fifty-seven thousand, nine hundred twenty".