20213040340 has 24 divisors (see below), whose sum is σ = 42450066792. Its totient is φ = 8084705280.

The previous prime is 20213040301. The next prime is 20213040349. The reversal of 20213040340 is 4304031202.

It can be written as a sum of positive squares in 4 ways, for example, as 1750752964 + 18462287376 = 41842^2 + 135876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213040349) 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, 561772 + ... + 596668.

It is an arithmetic number, because the mean of its divisors is an integer number (1768752783).

Almost surely, 2^20213040340 is an apocalyptic number.

20213040340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213040340 is an abundant number, since it is smaller than the sum of its proper divisors (22237026452).

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

20213040340 is a wasteful number, since it uses less digits than its factorization.

20213040340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63867 (or 63865 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20213040340 its reverse (4304031202), we get a palindrome (24517071542).

The spelling of 20213040340 in words is "twenty billion, two hundred thirteen million, forty thousand, three hundred forty".