20992000000 has 224 divisors, whose sum is σ = 53758491570. Its totient is φ = 8192000000.

The previous prime is 20991999991. The next prime is 20992000013. The reversal of 20992000000 is 29902.

It can be written as a sum of positive squares in 7 ways, for example, as 16680239104 + 4311760896 = 129152^2 + 65664^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 511999980 + ... + 512000020.

Almost surely, 2^20992000000 is an apocalyptic number.

20992000000 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 20992000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26879245785).

20992000000 is an abundant number, since it is smaller than the sum of its proper divisors (32766491570).

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

20992000000 is an frugal number, since it uses more digits than its factorization.

20992000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 20992000000 its reverse (29902), we get a palindrome (20992029902).

The spelling of 20992000000 in words is "twenty billion, nine hundred ninety-two million", and thus it is an aban number.