20430353140 has 12 divisors (see below), whose sum is σ = 42903741636. Its totient is φ = 8172141248.

The previous prime is 20430353137. The next prime is 20430353161. The reversal of 20430353140 is 4135303402.

It can be written as a sum of positive squares in 2 ways, for example, as 15442038756 + 4988314384 = 124266^2 + 70628^2 .

It is a congruent number.

It is an unprimeable number.

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, 510758809 + ... + 510758848.

It is an arithmetic number, because the mean of its divisors is an integer number (3575311803).

Almost surely, 2^20430353140 is an apocalyptic number.

20430353140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430353140 is an abundant number, since it is smaller than the sum of its proper divisors (22473388496).

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

20430353140 is a wasteful number, since it uses less digits than its factorization.

20430353140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021517666 (or 1021517664 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 20430353140 its reverse (4135303402), we get a palindrome (24565656542).

The spelling of 20430353140 in words is "twenty billion, four hundred thirty million, three hundred fifty-three thousand, one hundred forty".