20120120 has 16 divisors (see below), whose sum is σ = 45270360. Its totient is φ = 8048032.

The previous prime is 20120081. The next prime is 20120143. The reversal of 20120120 is 2102102.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 20120098 and 20120107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251462 + ... + 251541.

Almost surely, 2^20120120 is an apocalyptic number.

20120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120120 is an abundant number, since it is smaller than the sum of its proper divisors (25150240).

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

20120120 is a wasteful number, since it uses less digits than its factorization.

20120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503014 (or 503010 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20120120 is about 4485.5456747201. The cubic root of 20120120 is about 271.9841037423.

Adding to 20120120 its reverse (2102102), we get a palindrome (22222222).

The spelling of 20120120 in words is "twenty million, one hundred twenty thousand, one hundred twenty".