20432343400 has 144 divisors (see below), whose sum is σ = 55604521440. Its totient is φ = 6961852800.

The previous prime is 20432343361. The next prime is 20432343409. The reversal of 20432343400 is 434323402.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20432343409) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1591005 + ... + 1603795.

It is an arithmetic number, because the mean of its divisors is an integer number (386142510).

Almost surely, 2^20432343400 is an apocalyptic number.

20432343400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20432343400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27802260720).

20432343400 is an abundant number, since it is smaller than the sum of its proper divisors (35172178040).

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

20432343400 is a wasteful number, since it uses less digits than its factorization.

20432343400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12984 (or 12968 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 20432343400 its reverse (434323402), we get a palindrome (20866666802).

The spelling of 20432343400 in words is "twenty billion, four hundred thirty-two million, three hundred forty-three thousand, four hundred".