20509120 has 28 divisors (see below), whose sum is σ = 48838104. Its totient is φ = 8203520.

The previous prime is 20509117. The next prime is 20509127. The reversal of 20509120 is 2190502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20509127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31726 + ... + 32365.

It is an arithmetic number, because the mean of its divisors is an integer number (1744218).

Almost surely, 2^20509120 is an apocalyptic number.

20509120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20509120 is an abundant number, since it is smaller than the sum of its proper divisors (28328984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20509120 is an equidigital number, since it uses as much as digits as its factorization.

20509120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64108 (or 64098 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20509120 is about 4528.6995925983. The cubic root of 20509120 is about 273.7257632330.

Adding to 20509120 its reverse (2190502), we get a palindrome (22699622).

The spelling of 20509120 in words is "twenty million, five hundred nine thousand, one hundred twenty".