20450400000 has 216 divisors, whose sum is σ = 68038489008. Its totient is φ = 5452800000.

The previous prime is 20450399923. The next prime is 20450400023. The reversal of 20450400000 is 405402.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2395740 + ... + 2404260.

Almost surely, 2^20450400000 is an apocalyptic number.

20450400000 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 20450400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34019244504).

20450400000 is an abundant number, since it is smaller than the sum of its proper divisors (47588089008).

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

20450400000 is an frugal number, since it uses more digits than its factorization.

20450400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8565 (or 8531 counting only the distinct ones).

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

Adding to 20450400000 its reverse (405402), we get a palindrome (20450805402).

The spelling of 20450400000 in words is "twenty billion, four hundred fifty million, four hundred thousand".