20107551 has 4 divisors (see below), whose sum is σ = 26810072. Its totient is φ = 13405032.

The previous prime is 20107541. The next prime is 20107553. The reversal of 20107551 is 15570102.

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

It is not a de Polignac number, because 20107551 - 2⁵ = 20107519 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 (20107553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351256 + ... + 3351261.

It is an arithmetic number, because the mean of its divisors is an integer number (6702518).

Almost surely, 2^20107551 is an apocalyptic number.

20107551 is a deficient number, since it is larger than the sum of its proper divisors (6702521).

20107551 is an equidigital number, since it uses as much as digits as its factorization.

20107551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6702520.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20107551 is about 4484.1443999943. The cubic root of 20107551 is about 271.9274559638.

Adding to 20107551 its reverse (15570102), we get a palindrome (35677653).

The spelling of 20107551 in words is "twenty million, one hundred seven thousand, five hundred fifty-one".