20443554 has 24 divisors (see below), whose sum is σ = 46900620. Its totient is φ = 6413568.

The previous prime is 20443529. The next prime is 20443561. The reversal of 20443554 is 45534402.

It can be written as a sum of positive squares in 2 ways, for example, as 20115225 + 328329 = 4485^2 + 573^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33099 + ... + 33710.

Almost surely, 2^20443554 is an apocalyptic number.

20443554 is an abundant number, since it is smaller than the sum of its proper divisors (26457066).

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

20443554 is a wasteful number, since it uses less digits than its factorization.

20443554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66834 (or 66831 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 20443554 is about 4521.4548543583. The cubic root of 20443554 is about 273.4337587885.

Adding to 20443554 its reverse (45534402), we get a palindrome (65977956).

The spelling of 20443554 in words is "twenty million, four hundred forty-three thousand, five hundred fifty-four".