20305392 has 40 divisors (see below), whose sum is σ = 52950480. Its totient is φ = 6704640.

The previous prime is 20305391. The next prime is 20305409. The reversal of 20305392 is 29350302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305391) 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, 3292 + ... + 7172.

It is an arithmetic number, because the mean of its divisors is an integer number (1323762).

Almost surely, 2^20305392 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 20305392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26475240).

20305392 is an abundant number, since it is smaller than the sum of its proper divisors (32645088).

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

20305392 is a wasteful number, since it uses less digits than its factorization.

20305392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001 (or 3995 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 20305392 is about 4506.1504635331. The cubic root of 20305392 is about 272.8163909164.

Adding to 20305392 its reverse (29350302), we get a palindrome (49655694).

The spelling of 20305392 in words is "twenty million, three hundred five thousand, three hundred ninety-two".