20238456 has 64 divisors (see below), whose sum is σ = 58233600. Its totient is φ = 5741568.

The previous prime is 20238437. The next prime is 20238469. The reversal of 20238456 is 65483202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29736 + ... + 30408.

It is an arithmetic number, because the mean of its divisors is an integer number (909900).

Almost surely, 2^20238456 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 20238456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29116800).

20238456 is an abundant number, since it is smaller than the sum of its proper divisors (37995144).

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

20238456 is a wasteful number, since it uses less digits than its factorization.

20238456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 864 counting only the distinct ones).

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

The square root of 20238456 is about 4498.7171504775. The cubic root of 20238456 is about 272.5162844125.

The spelling of 20238456 in words is "twenty million, two hundred thirty-eight thousand, four hundred fifty-six".