20240020 has 24 divisors (see below), whose sum is σ = 42946344. Its totient is φ = 8011776.

The previous prime is 20239991. The next prime is 20240021. The reversal of 20240020 is 2004202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2650384 + 17589636 = 1628^2 + 4194^2 .

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 = 20239979 and 20240006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20240021) 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, 3277 + ... + 7156.

It is an arithmetic number, because the mean of its divisors is an integer number (1789431).

Almost surely, 2^20240020 is an apocalyptic number.

20240020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20240020 is an abundant number, since it is smaller than the sum of its proper divisors (22706324).

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

20240020 is a wasteful number, since it uses less digits than its factorization.

20240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10539 (or 10537 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20240020 is about 4498.8909744514. The cubic root of 20240020 is about 272.5233041260.

Adding to 20240020 its reverse (2004202), we get a palindrome (22244222).

The spelling of 20240020 in words is "twenty million, two hundred forty thousand, twenty".