20620244140 has 24 divisors (see below), whose sum is σ = 43362768960. Its totient is φ = 8236620288.

The previous prime is 20620244137. The next prime is 20620244149. The reversal of 20620244140 is 4144202602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20620244149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702597 + ... + 731356.

It is an arithmetic number, because the mean of its divisors is an integer number (1806782040).

Almost surely, 2^20620244140 is an apocalyptic number.

20620244140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20620244140 is an abundant number, since it is smaller than the sum of its proper divisors (22742524820).

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

20620244140 is a wasteful number, since it uses less digits than its factorization.

20620244140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434681 (or 1434679 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 20620244140 its reverse (4144202602), we get a palindrome (24764446742).

The spelling of 20620244140 in words is "twenty billion, six hundred twenty million, two hundred forty-four thousand, one hundred forty".