20431421020 has 96 divisors (see below), whose sum is σ = 43957976832. Its totient is φ = 7975623168.

The previous prime is 20431420987. The next prime is 20431421029. The reversal of 20431421020 is 2012413402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431421029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66551707 + ... + 66552013.

It is an arithmetic number, because the mean of its divisors is an integer number (457895592).

Almost surely, 2^20431421020 is an apocalyptic number.

20431421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431421020 is an abundant number, since it is smaller than the sum of its proper divisors (23526555812).

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

20431421020 is a wasteful number, since it uses less digits than its factorization.

20431421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20431421020 its reverse (2012413402), we get a palindrome (22443834422).

The spelling of 20431421020 in words is "twenty billion, four hundred thirty-one million, four hundred twenty-one thousand, twenty".