20543569920 has 504 divisors, whose sum is σ = 75641886936. Its totient is φ = 5350883328.

The previous prime is 20543569919. The next prime is 20543569933. The reversal of 20543569920 is 2996534502.

20543569920 is a `hidden beast` number, since 20 + 5 + 43 + 569 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 477757419 + ... + 477757461.

It is an arithmetic number, because the mean of its divisors is an integer number (150083109).

Almost surely, 2^20543569920 is an apocalyptic number.

20543569920 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 20543569920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37820943468).

20543569920 is an abundant number, since it is smaller than the sum of its proper divisors (55098317016).

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

20543569920 is an frugal number, since it uses more digits than its factorization.

20543569920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 20543569920 in words is "twenty billion, five hundred forty-three million, five hundred sixty-nine thousand, nine hundred twenty".