20120551 has 4 divisors (see below), whose sum is σ = 21949704. Its totient is φ = 18291400.

The previous prime is 20120543. The next prime is 20120623. The reversal of 20120551 is 15502102.

20120551 is nontrivially palindromic in base 7.

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 20120551 - 2³ = 20120543 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 (20120501) 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, 914560 + ... + 914581.

It is an arithmetic number, because the mean of its divisors is an integer number (5487426).

Almost surely, 2^20120551 is an apocalyptic number.

20120551 is a deficient number, since it is larger than the sum of its proper divisors (1829153).

20120551 is a wasteful number, since it uses less digits than its factorization.

20120551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829152.

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

The square root of 20120551 is about 4485.5937176699. The cubic root of 20120551 is about 271.9860458167.

Adding to 20120551 its reverse (15502102), we get a palindrome (35622653).

The spelling of 20120551 in words is "twenty million, one hundred twenty thousand, five hundred fifty-one".