20551300 has 144 divisors (see below), whose sum is σ = 59246208. Its totient is φ = 5990400.

The previous prime is 20551277. The next prime is 20551303. The reversal of 20551300 is 315502.

It is not an unprimeable number, because it can be changed into a prime (20551303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 130822 + ... + 130978.

It is an arithmetic number, because the mean of its divisors is an integer number (411432).

Almost surely, 2^20551300 is an apocalyptic number.

20551300 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 20551300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29623104).

20551300 is an abundant number, since it is smaller than the sum of its proper divisors (38694908).

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

20551300 is a wasteful number, since it uses less digits than its factorization.

20551300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20551300 is about 4533.3541666188. The cubic root of 20551300 is about 273.9132870688.

Adding to 20551300 its reverse (315502), we get a palindrome (20866802).

The spelling of 20551300 in words is "twenty million, five hundred fifty-one thousand, three hundred".