20423143430 has 32 divisors (see below), whose sum is σ = 37401632928. Its totient is φ = 8027308800.

The previous prime is 20423143421. The next prime is 20423143451. The reversal of 20423143430 is 3434132402.

It is a self number, because there is not a number n which added to its sum of digits gives 20423143430.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613925 + ... + 646335.

It is an arithmetic number, because the mean of its divisors is an integer number (1168801029).

Almost surely, 2^20423143430 is an apocalyptic number.

20423143430 is a deficient number, since it is larger than the sum of its proper divisors (16978489498).

20423143430 is a wasteful number, since it uses less digits than its factorization.

20423143430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33512.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 20423143430 its reverse (3434132402), we get a palindrome (23857275832).

The spelling of 20423143430 in words is "twenty billion, four hundred twenty-three million, one hundred forty-three thousand, four hundred thirty".