4000020551 has 16 divisors (see below), whose sum is σ = 4314851328. Its totient is φ = 3697293600.

The previous prime is 4000020523. The next prime is 4000020569. The reversal of 4000020551 is 1550200004.

It is a cyclic number.

It is not a de Polignac number, because 4000020551 - 2⁶ = 4000020487 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 (4000020571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536036 + ... + 543446.

It is an arithmetic number, because the mean of its divisors is an integer number (269678208).

Almost surely, 2^4000020551 is an apocalyptic number.

4000020551 is a deficient number, since it is larger than the sum of its proper divisors (314830777).

4000020551 is a wasteful number, since it uses less digits than its factorization.

4000020551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8222.

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

The square root of 4000020551 is about 63245.7156730794. The cubic root of 4000020551 is about 1587.4037705201.

Adding to 4000020551 its reverse (1550200004), we get a palindrome (5550220555).

The spelling of 4000020551 in words is "four billion, twenty thousand, five hundred fifty-one".