20551107 has 4 divisors (see below), whose sum is σ = 27401480. Its totient is φ = 13700736.

The previous prime is 20551073. The next prime is 20551129. The reversal of 20551107 is 70115502.

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

It is not a de Polignac number, because 20551107 - 2⁶ = 20551043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551007) 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, 3425182 + ... + 3425187.

It is an arithmetic number, because the mean of its divisors is an integer number (6850370).

Almost surely, 2^20551107 is an apocalyptic number.

20551107 is a deficient number, since it is larger than the sum of its proper divisors (6850373).

20551107 is an equidigital number, since it uses as much as digits as its factorization.

20551107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850372.

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

The square root of 20551107 is about 4533.3328799019. The cubic root of 20551107 is about 273.9124296140.

Adding to 20551107 its reverse (70115502), we get a palindrome (90666609).

The spelling of 20551107 in words is "twenty million, five hundred fifty-one thousand, one hundred seven".