20442520 has 32 divisors (see below), whose sum is σ = 52567200. Its totient is φ = 7008768.

The previous prime is 20442511. The next prime is 20442523. The reversal of 20442520 is 2524402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442523) 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, 36225 + ... + 36784.

It is an arithmetic number, because the mean of its divisors is an integer number (1642725).

Almost surely, 2^20442520 is an apocalyptic number.

20442520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20442520 is an abundant number, since it is smaller than the sum of its proper divisors (32124680).

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

20442520 is a wasteful number, since it uses less digits than its factorization.

20442520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73027 (or 73023 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20442520 is about 4521.3405091853. The cubic root of 20442520 is about 273.4291487735.

Adding to 20442520 its reverse (2524402), we get a palindrome (22966922).

It can be divided in two parts, 204 and 42520, that added together give a palindrome (42724).

The spelling of 20442520 in words is "twenty million, four hundred forty-two thousand, five hundred twenty".