20253440000 has 120 divisors (see below), whose sum is σ = 50608237680. Its totient is φ = 8100864000.

The previous prime is 20253439961. The next prime is 20253440003. The reversal of 20253440000 is 4435202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20253440003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1272089 + ... + 1287911.

It is an arithmetic number, because the mean of its divisors is an integer number (421735314).

Almost surely, 2^20253440000 is an apocalyptic number.

20253440000 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 20253440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25304118840).

20253440000 is an abundant number, since it is smaller than the sum of its proper divisors (30354797680).

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

20253440000 is an frugal number, since it uses more digits than its factorization.

20253440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15865 (or 15830 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

Adding to 20253440000 its reverse (4435202), we get a palindrome (20257875202).

The spelling of 20253440000 in words is "twenty billion, two hundred fifty-three million, four hundred forty thousand".