20155000551 has 32 divisors (see below), whose sum is σ = 32079989760. Its totient is φ = 11012004864.

The previous prime is 20155000543. The next prime is 20155000583. The reversal of 20155000551 is 15500055102.

It is not a de Polignac number, because 20155000551 - 2³ = 20155000543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155000511) 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 31 ways as a sum of consecutive naturals, for example, 97930 + ... + 223383.

It is an arithmetic number, because the mean of its divisors is an integer number (1002499680).

Almost surely, 2^20155000551 is an apocalyptic number.

20155000551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20155000551 is a deficient number, since it is larger than the sum of its proper divisors (11924989209).

20155000551 is a wasteful number, since it uses less digits than its factorization.

20155000551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321455.

The product of its (nonzero) digits is 1250, while the sum is 24.

Adding to 20155000551 its reverse (15500055102), we get a palindrome (35655055653).

The spelling of 20155000551 in words is "twenty billion, one hundred fifty-five million, five hundred fifty-one", and thus it is an aban number.