20455406780 has 24 divisors (see below), whose sum is σ = 43381668960. Its totient is φ = 8101150400.

The previous prime is 20455406771. The next prime is 20455406813. The reversal of 20455406780 is 8760455402.

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 7 ways as a sum of consecutive naturals, for example, 5061200 + ... + 5065239.

It is an arithmetic number, because the mean of its divisors is an integer number (1807569540).

Almost surely, 2^20455406780 is an apocalyptic number.

20455406780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455406780 is an abundant number, since it is smaller than the sum of its proper divisors (22926262180).

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

20455406780 is a wasteful number, since it uses less digits than its factorization.

20455406780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126549 (or 10126547 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 41.

The spelling of 20455406780 in words is "twenty billion, four hundred fifty-five million, four hundred six thousand, seven hundred eighty".