20534400000 has 792 divisors, whose sum is σ = 79827890688. Its totient is φ = 5068800000.

The previous prime is 20534399999. The next prime is 20534400053. The reversal of 20534400000 is 443502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 662399985 + ... + 662400015.

Almost surely, 2^20534400000 is an apocalyptic number.

20534400000 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 20534400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39913945344).

20534400000 is an abundant number, since it is smaller than the sum of its proper divisors (59293490688).

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

20534400000 is an equidigital number, since it uses as much as digits as its factorization.

20534400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

Adding to 20534400000 its reverse (443502), we get a palindrome (20534843502).

The spelling of 20534400000 in words is "twenty billion, five hundred thirty-four million, four hundred thousand".