20451923520 has 112 divisors (see below), whose sum is σ = 74211289728. Its totient is φ = 4674723840.

The previous prime is 20451923501. The next prime is 20451923521. The reversal of 20451923520 is 2532915402.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (20451923521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515001 + ... + 1528440.

Almost surely, 2^20451923520 is an apocalyptic number.

20451923520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20451923520 is an abundant number, since it is smaller than the sum of its proper divisors (53759366208).

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

20451923520 is a wasteful number, since it uses less digits than its factorization.

20451923520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043468 (or 3043458 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 20451923520 in words is "twenty billion, four hundred fifty-one million, nine hundred twenty-three thousand, five hundred twenty".