20423240421 has 8 divisors (see below), whose sum is σ = 27293878080. Its totient is φ = 13584048192.

The previous prime is 20423240419. The next prime is 20423240437. The reversal of 20423240421 is 12404232402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20423240421 - 2¹ = 20423240419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20423240391 and 20423240400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423240021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7859841 + ... + 7862438.

It is an arithmetic number, because the mean of its divisors is an integer number (3411734760).

Almost surely, 2^20423240421 is an apocalyptic number.

It is an amenable number.

20423240421 is a deficient number, since it is larger than the sum of its proper divisors (6870637659).

20423240421 is a wasteful number, since it uses less digits than its factorization.

20423240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15722715.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20423240421 its reverse (12404232402), we get a palindrome (32827472823).

The spelling of 20423240421 in words is "twenty billion, four hundred twenty-three million, two hundred forty thousand, four hundred twenty-one".