120020551 has 6 divisors (see below), whose sum is σ = 139615800. Its totient is φ = 102874716.

The previous prime is 120020519. The next prime is 120020597. The reversal of 120020551 is 155020021.

It is not a de Polignac number, because 120020551 - 2⁵ = 120020519 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 (120020501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1224651 + ... + 1224748.

It is an arithmetic number, because the mean of its divisors is an integer number (23269300).

Almost surely, 2^120020551 is an apocalyptic number.

120020551 is a deficient number, since it is larger than the sum of its proper divisors (19595249).

120020551 is an equidigital number, since it uses as much as digits as its factorization.

120020551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449413 (or 2449406 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 120020551 is about 10955.3891304691. The cubic root of 120020551 is about 493.2705705502.

Adding to 120020551 its reverse (155020021), we get a palindrome (275040572).

The spelling of 120020551 in words is "one hundred twenty million, twenty thousand, five hundred fifty-one".