20555533000 has 128 divisors (see below), whose sum is σ = 51692359680. Its totient is φ = 7622630400.

The previous prime is 20555532989. The next prime is 20555533027. The reversal of 20555533000 is 33555502.

It is a self number, because there is not a number n which added to its sum of digits gives 20555533000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1129977 + ... + 1148023.

It is an arithmetic number, because the mean of its divisors is an integer number (403846560).

Almost surely, 2^20555533000 is an apocalyptic number.

20555533000 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 20555533000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25846179840).

20555533000 is an abundant number, since it is smaller than the sum of its proper divisors (31136826680).

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

20555533000 is a wasteful number, since it uses less digits than its factorization.

20555533000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18152 (or 18138 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 28.

The spelling of 20555533000 in words is "twenty billion, five hundred fifty-five million, five hundred thirty-three thousand".