20202120 has 96 divisors (see below), whose sum is σ = 69540120. Its totient is φ = 5068800.

The previous prime is 20202113. The next prime is 20202167. The reversal of 20202120 is 2120202.

It can be written as a sum of positive squares in 4 ways, for example, as 16016004 + 4186116 = 4002^2 + 2046^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4470 + ... + 7770.

Almost surely, 2^20202120 is an apocalyptic number.

20202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20202120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34770060).

20202120 is an abundant number, since it is smaller than the sum of its proper divisors (49338000).

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

20202120 is a wasteful number, since it uses less digits than its factorization.

20202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335 (or 3328 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20202120 is about 4494.6768515656. The cubic root of 20202120 is about 272.3530953544.

Adding to 20202120 its reverse (2120202), we get a palindrome (22322322).

The spelling of 20202120 in words is "twenty million, two hundred two thousand, one hundred twenty".