20432320 has 56 divisors (see below), whose sum is σ = 49432464. Its totient is φ = 8042496.

The previous prime is 20432297. The next prime is 20432329. The reversal of 20432320 is 2323402.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20432294 and 20432303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20964 + ... + 21916.

Almost surely, 2^20432320 is an apocalyptic number.

20432320 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 20432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24716232).

20432320 is an abundant number, since it is smaller than the sum of its proper divisors (29000144).

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

20432320 is an equidigital number, since it uses as much as digits as its factorization.

20432320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20432320 is about 4520.2123843908. The cubic root of 20432320 is about 273.3836644707.

Adding to 20432320 its reverse (2323402), we get a palindrome (22755722).

The spelling of 20432320 in words is "twenty million, four hundred thirty-two thousand, three hundred twenty".