20503443000 has 128 divisors (see below), whose sum is σ = 64401480000. Its totient is φ = 5430771200.

The previous prime is 20503442881. The next prime is 20503443019. The reversal of 20503443000 is 34430502.

It is a happy number.

It is a congruent number.

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, 424066 + ... + 469934.

Almost surely, 2^20503443000 is an apocalyptic number.

20503443000 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 20503443000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32200740000).

20503443000 is an abundant number, since it is smaller than the sum of its proper divisors (43898037000).

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

20503443000 is a wasteful number, since it uses less digits than its factorization.

20503443000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46042 (or 46028 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

Adding to 20503443000 its reverse (34430502), we get a palindrome (20537873502).

The spelling of 20503443000 in words is "twenty billion, five hundred three million, four hundred forty-three thousand".