20449000000 has 441 divisors, whose sum is σ = 60371356143. Its totient is φ = 6864000000.

The previous prime is 20448999997. The next prime is 20449000007. The reversal of 20449000000 is 94402.

The square root of 20449000000 is 143000.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 10 ways, for example, as 9593027136 + 10855972864 = 97944^2 + 104192^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20449000007) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 1572999994 + ... + 1573000006.

Almost surely, 2^20449000000 is an apocalyptic number.

20449000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20449000000 is the 143000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20449000000

20449000000 is an abundant number, since it is smaller than the sum of its proper divisors (39922356143).

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

20449000000 is an frugal number, since it uses more digits than its factorization.

20449000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20449000000 its reverse (94402), we get a palindrome (20449094402).

The spelling of 20449000000 in words is "twenty billion, four hundred forty-nine million", and thus it is an aban number.