20451573632 has 64 divisors (see below), whose sum is σ = 46599352800. Its totient is φ = 8758278144.

The previous prime is 20451573617. The next prime is 20451573689. The reversal of 20451573632 is 23637515402.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1272398 + ... + 1288370.

Almost surely, 2^20451573632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20451573632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23299676400).

20451573632 is an abundant number, since it is smaller than the sum of its proper divisors (26147779168).

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

20451573632 is a wasteful number, since it uses less digits than its factorization.

20451573632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17423 (or 17411 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The spelling of 20451573632 in words is "twenty billion, four hundred fifty-one million, five hundred seventy-three thousand, six hundred thirty-two".