20455532020 has 192 divisors, whose sum is σ = 54385551360. Its totient is φ = 6277824000.

The previous prime is 20455532003. The next prime is 20455532077. The reversal of 20455532020 is 2023555402.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 20455532020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53972191 + ... + 53972569.

It is an arithmetic number, because the mean of its divisors is an integer number (283258080).

Almost surely, 2^20455532020 is an apocalyptic number.

20455532020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20455532020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27192775680).

20455532020 is an abundant number, since it is smaller than the sum of its proper divisors (33930019340).

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

20455532020 is a wasteful number, since it uses less digits than its factorization.

20455532020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 28.

The spelling of 20455532020 in words is "twenty billion, four hundred fifty-five million, five hundred thirty-two thousand, twenty".