20818032 has 40 divisors (see below), whose sum is σ = 54698880. Its totient is φ = 6820800.

The previous prime is 20818009. The next prime is 20818073. The reversal of 20818032 is 23081802.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20817993 and 20818011.

It is a congruent number.

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, 844 + ... + 6507.

It is an arithmetic number, because the mean of its divisors is an integer number (1367472).

Almost surely, 2^20818032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20818032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27349440).

20818032 is an abundant number, since it is smaller than the sum of its proper divisors (33880848).

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

20818032 is a wasteful number, since it uses less digits than its factorization.

20818032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7421 (or 7415 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20818032 is about 4562.6781609051. The cubic root of 20818032 is about 275.0932223894.

Adding to 20818032 its reverse (23081802), we get a palindrome (43899834).

The spelling of 20818032 in words is "twenty million, eight hundred eighteen thousand, thirty-two".