20021244340 has 12 divisors (see below), whose sum is σ = 42044613156. Its totient is φ = 8008497728.

The previous prime is 20021244337. The next prime is 20021244349. The reversal of 20021244340 is 4344212002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2028241296 + 17993003044 = 45036^2 + 134138^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021244349) 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 3 ways as a sum of consecutive naturals, for example, 500531089 + ... + 500531128.

It is an arithmetic number, because the mean of its divisors is an integer number (3503717763).

Almost surely, 2^20021244340 is an apocalyptic number.

20021244340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021244340 is an abundant number, since it is smaller than the sum of its proper divisors (22023368816).

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

20021244340 is a wasteful number, since it uses less digits than its factorization.

20021244340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001062226 (or 1001062224 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20021244340 its reverse (4344212002), we get a palindrome (24365456342).

The spelling of 20021244340 in words is "twenty billion, twenty-one million, two hundred forty-four thousand, three hundred forty".