20212120 has 32 divisors (see below), whose sum is σ = 45936720. Its totient is φ = 8003200.

The previous prime is 20212117. The next prime is 20212151. The reversal of 20212120 is 2121202.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20212097 and 20212106.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1539 + ... + 6541.

Almost surely, 2^20212120 is an apocalyptic number.

20212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212120 is an abundant number, since it is smaller than the sum of its proper divisors (25724600).

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

20212120 is a wasteful number, since it uses less digits than its factorization.

20212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115 (or 5111 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20212120 is about 4495.7891409629. The cubic root of 20212120 is about 272.3980259804.

Adding to 20212120 its reverse (2121202), we get a palindrome (22333322).

The spelling of 20212120 in words is "twenty million, two hundred twelve thousand, one hundred twenty".