20424220423 has 4 divisors (see below), whose sum is σ = 20424507480. Its totient is φ = 20423933368.

The previous prime is 20424220387. The next prime is 20424220459. The reversal of 20424220423 is 32402242402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (20424220387) and next prime (20424220459).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424220423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424220463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51861 + ... + 208657.

It is an arithmetic number, because the mean of its divisors is an integer number (5106126870).

Almost surely, 2^20424220423 is an apocalyptic number.

20424220423 is a deficient number, since it is larger than the sum of its proper divisors (287057).

20424220423 is a wasteful number, since it uses less digits than its factorization.

20424220423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287056.

The product of its (nonzero) digits is 6144, while the sum is 25.

Adding to 20424220423 its reverse (32402242402), we get a palindrome (52826462825).

The spelling of 20424220423 in words is "twenty billion, four hundred twenty-four million, two hundred twenty thousand, four hundred twenty-three".