20550440000 has 70 divisors (see below), whose sum is σ = 50958511494. Its totient is φ = 8220160000.

The previous prime is 20550439967. The next prime is 20550440011. The reversal of 20550440000 is 4405502.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 10123579456 + 10426860544 = 100616^2 + 102112^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 216881 + ... + 296880.

Almost surely, 2^20550440000 is an apocalyptic number.

20550440000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550440000 is an abundant number, since it is smaller than the sum of its proper divisors (30408071494).

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

20550440000 is an frugal number, since it uses more digits than its factorization.

20550440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513793 (or 513768 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

Adding to 20550440000 its reverse (4405502), we get a palindrome (20554845502).

The spelling of 20550440000 in words is "twenty billion, five hundred fifty million, four hundred forty thousand".