20865324 has 48 divisors (see below), whose sum is σ = 53803008. Its totient is φ = 6259968.

The previous prime is 20865319. The next prime is 20865329. The reversal of 20865324 is 42356802.

It is an interprime number because it is at equal distance from previous prime (20865319) and next prime (20865329).

It is a junction number, because it is equal to n+sod(n) for n = 20865291 and 20865300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2469 + ... + 6915.

It is an arithmetic number, because the mean of its divisors is an integer number (1120896).

Almost surely, 2^20865324 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 20865324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26901504).

20865324 is an abundant number, since it is smaller than the sum of its proper divisors (32937684).

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

20865324 is a wasteful number, since it uses less digits than its factorization.

20865324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494 (or 4492 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20865324 is about 4567.8577035630. The cubic root of 20865324 is about 275.3013731850.

The spelling of 20865324 in words is "twenty million, eight hundred sixty-five thousand, three hundred twenty-four".