20540400000 has 192 divisors, whose sum is σ = 68200166160. Its totient is φ = 5477120000.

The previous prime is 20540399993. The next prime is 20540400011. The reversal of 20540400000 is 404502.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1191442 + ... + 1208558.

Almost surely, 2^20540400000 is an apocalyptic number.

20540400000 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 20540400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34100083080).

20540400000 is an abundant number, since it is smaller than the sum of its proper divisors (47659766160).

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

20540400000 is an frugal number, since it uses more digits than its factorization.

20540400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17159 (or 17127 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

Adding to 20540400000 its reverse (404502), we get a palindrome (20540804502).

The spelling of 20540400000 in words is "twenty billion, five hundred forty million, four hundred thousand".