20551443 has 16 divisors (see below), whose sum is σ = 31193856. Its totient is φ = 11913440.

The previous prime is 20551441. The next prime is 20551451. The reversal of 20551443 is 34415502.

It is not a de Polignac number, because 20551443 - 2¹ = 20551441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20551441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12780 + ... + 14297.

It is an arithmetic number, because the mean of its divisors is an integer number (1949616).

Almost surely, 2^20551443 is an apocalyptic number.

20551443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20551443 is a deficient number, since it is larger than the sum of its proper divisors (10642413).

20551443 is a wasteful number, since it uses less digits than its factorization.

20551443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27114.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20551443 is about 4533.3699385777. The cubic root of 20551443 is about 273.9139223815.

Adding to 20551443 its reverse (34415502), we get a palindrome (54966945).

The spelling of 20551443 in words is "twenty million, five hundred fifty-one thousand, four hundred forty-three".