20000043551 has 4 divisors (see below), whose sum is σ = 20339027400. Its totient is φ = 19661059704.

The previous prime is 20000043521. The next prime is 20000043593. The reversal of 20000043551 is 15534000002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20000043551 - 2⁶ = 20000043487 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 (20000043521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169491836 + ... + 169491953.

It is an arithmetic number, because the mean of its divisors is an integer number (5084756850).

Almost surely, 2^20000043551 is an apocalyptic number.

20000043551 is a deficient number, since it is larger than the sum of its proper divisors (338983849).

20000043551 is an equidigital number, since it uses as much as digits as its factorization.

20000043551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338983848.

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 20000043551 its reverse (15534000002), we get a palindrome (35534043553).

The spelling of 20000043551 in words is "twenty billion, forty-three thousand, five hundred fifty-one".