20291392 has 112 divisors (see below), whose sum is σ = 48646080. Its totient is φ = 8294400.

The previous prime is 20291389. The next prime is 20291393. The reversal of 20291392 is 29319202.

It is a self number, because there is not a number n which added to its sum of digits gives 20291392.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20291393) 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, 494892 + ... + 494932.

It is an arithmetic number, because the mean of its divisors is an integer number (434340).

Almost surely, 2^20291392 is an apocalyptic number.

20291392 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 20291392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24323040).

20291392 is an abundant number, since it is smaller than the sum of its proper divisors (28354688).

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

20291392 is a wasteful number, since it uses less digits than its factorization.

20291392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20291392 is about 4504.5967633075. The cubic root of 20291392 is about 272.7536767433.

The spelling of 20291392 in words is "twenty million, two hundred ninety-one thousand, three hundred ninety-two".