20320340430 has 64 divisors (see below), whose sum is σ = 53939769408. Its totient is φ = 4866739200.

The previous prime is 20320340429. The next prime is 20320340471. The reversal of 20320340430 is 3404302302.

It is a junction number, because it is equal to n+sod(n) for n = 20320340397 and 20320340406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 689671 + ... + 718530.

It is an arithmetic number, because the mean of its divisors is an integer number (842808897).

Almost surely, 2^20320340430 is an apocalyptic number.

20320340430 is an abundant number, since it is smaller than the sum of its proper divisors (33619428978).

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

20320340430 is a wasteful number, since it uses less digits than its factorization.

20320340430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408261.

The product of its (nonzero) digits is 1728, while the sum is 21.

Adding to 20320340430 its reverse (3404302302), we get a palindrome (23724642732).

The spelling of 20320340430 in words is "twenty billion, three hundred twenty million, three hundred forty thousand, four hundred thirty".