20431460421 has 24 divisors (see below), whose sum is σ = 32092668504. Its totient is φ = 12473256960.

The previous prime is 20431460417. The next prime is 20431460431. The reversal of 20431460421 is 12406413402.

It is a happy number.

20431460421 is a `hidden beast` number, since 2 + 0 + 4 + 31 + 4 + 604 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9883143396 + 10548317025 = 99414^2 + 102705^2 .

It is not a de Polignac number, because 20431460421 - 2² = 20431460417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431460431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1798920 + ... + 1810241.

It is an arithmetic number, because the mean of its divisors is an integer number (1337194521).

Almost surely, 2^20431460421 is an apocalyptic number.

It is an amenable number.

20431460421 is a deficient number, since it is larger than the sum of its proper divisors (11661208083).

20431460421 is a wasteful number, since it uses less digits than its factorization.

20431460421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609221 (or 3609218 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 20431460421 its reverse (12406413402), we get a palindrome (32837873823).

The spelling of 20431460421 in words is "twenty billion, four hundred thirty-one million, four hundred sixty thousand, four hundred twenty-one".