20442120 has 32 divisors (see below), whose sum is σ = 61326720. Its totient is φ = 5451200.

The previous prime is 20442091. The next prime is 20442127. The reversal of 20442120 is 2124402.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20442120.

It is not an unprimeable number, because it can be changed into a prime (20442127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85056 + ... + 85295.

It is an arithmetic number, because the mean of its divisors is an integer number (1916460).

Almost surely, 2^20442120 is an apocalyptic number.

20442120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20442120 is an abundant number, since it is smaller than the sum of its proper divisors (40884600).

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

20442120 is a wasteful number, since it uses less digits than its factorization.

20442120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170365 (or 170361 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20442120 is about 4521.2962743001. The cubic root of 20442120 is about 273.4273653604.

Adding to 20442120 its reverse (2124402), we get a palindrome (22566522).

It can be divided in two parts, 204 and 42120, that added together give a palindrome (42324).

The spelling of 20442120 in words is "twenty million, four hundred forty-two thousand, one hundred twenty".