20518432 has 48 divisors (see below), whose sum is σ = 44743104. Its totient is φ = 9184000.

The previous prime is 20518429. The next prime is 20518441. The reversal of 20518432 is 23481502.

It is a junction number, because it is equal to n+sod(n) for n = 20518397 and 20518406.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24582 + ... + 25402.

It is an arithmetic number, because the mean of its divisors is an integer number (932148).

Almost surely, 2^20518432 is an apocalyptic number.

20518432 is a gapful number since it is divisible by the number (22) 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 20518432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22371552).

20518432 is an abundant number, since it is smaller than the sum of its proper divisors (24224672).

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

20518432 is a wasteful number, since it uses less digits than its factorization.

20518432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20518432 is about 4529.7275856281. The cubic root of 20518432 is about 273.7671846207.

Adding to 20518432 its reverse (23481502), we get a palindrome (43999934).

The spelling of 20518432 in words is "twenty million, five hundred eighteen thousand, four hundred thirty-two".