20454431320 has 32 divisors (see below), whose sum is σ = 46035554400. Its totient is φ = 8179446528.

The previous prime is 20454431287. The next prime is 20454431321. The reversal of 20454431320 is 2313445402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454431321) 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, 73396 + ... + 215164.

It is an arithmetic number, because the mean of its divisors is an integer number (1438611075).

Almost surely, 2^20454431320 is an apocalyptic number.

20454431320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20454431320 is an abundant number, since it is smaller than the sum of its proper divisors (25581123080).

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

20454431320 is a wasteful number, since it uses less digits than its factorization.

20454431320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145387 (or 145383 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20454431320 its reverse (2313445402), we get a palindrome (22767876722).

The spelling of 20454431320 in words is "twenty billion, four hundred fifty-four million, four hundred thirty-one thousand, three hundred twenty".