20004551 has 8 divisors (see below), whose sum is σ = 22917504. Its totient is φ = 17105400.

The previous prime is 20004541. The next prime is 20004559. The reversal of 20004551 is 15540002.

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 20004551 - 2⁶ = 20004487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004559) 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, 125 + ... + 6326.

It is an arithmetic number, because the mean of its divisors is an integer number (2864688).

Almost surely, 2^20004551 is an apocalyptic number.

20004551 is a deficient number, since it is larger than the sum of its proper divisors (2912953).

20004551 is an equidigital number, since it uses as much as digits as its factorization.

20004551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20004551 is about 4472.6447433258. The cubic root of 20004551 is about 271.4623489556.

Adding to 20004551 its reverse (15540002), we get a palindrome (35544553).

The spelling of 20004551 in words is "twenty million, four thousand, five hundred fifty-one".