20543722100 has 72 divisors (see below), whose sum is σ = 48924243648. Its totient is φ = 7425644800.

The previous prime is 20543722093. The next prime is 20543722109. The reversal of 20543722100 is 122734502.

It is a self number, because there is not a number n which added to its sum of digits gives 20543722100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543722109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127784 + ... + 239616.

It is an arithmetic number, because the mean of its divisors is an integer number (679503384).

Almost surely, 2^20543722100 is an apocalyptic number.

20543722100 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 20543722100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24462121824).

20543722100 is an abundant number, since it is smaller than the sum of its proper divisors (28380521548).

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

20543722100 is a wasteful number, since it uses less digits than its factorization.

20543722100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112025 (or 112018 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The spelling of 20543722100 in words is "twenty billion, five hundred forty-three million, seven hundred twenty-two thousand, one hundred".