20005553 has 8 divisors (see below), whose sum is σ = 20229888. Its totient is φ = 19782864.

The previous prime is 20005541. The next prime is 20005589. The reversal of 20005553 is 35550002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20005553 - 2¹⁶ = 19940017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62951 + ... + 63267.

It is an arithmetic number, because the mean of its divisors is an integer number (2528736).

Almost surely, 2^20005553 is an apocalyptic number.

It is an amenable number.

20005553 is a deficient number, since it is larger than the sum of its proper divisors (224335).

20005553 is a wasteful number, since it uses less digits than its factorization.

20005553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823.

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 20005553 is about 4472.7567561852. The cubic root of 20005553 is about 271.4668812699.

Adding to 20005553 its reverse (35550002), we get a palindrome (55555555).

The spelling of 20005553 in words is "twenty million, five thousand, five hundred fifty-three".