20178241 has 4 divisors (see below), whose sum is σ = 20829184. Its totient is φ = 19527300.

The previous prime is 20178239. The next prime is 20178253. The reversal of 20178241 is 14287102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20178241 - 2¹ = 20178239 is a prime.

It is a super-2 number, since 2×20178241² = 814322819708162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20178341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325425 + ... + 325486.

It is an arithmetic number, because the mean of its divisors is an integer number (5207296).

Almost surely, 2^20178241 is an apocalyptic number.

It is an amenable number.

20178241 is a deficient number, since it is larger than the sum of its proper divisors (650943).

20178241 is an equidigital number, since it uses as much as digits as its factorization.

20178241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650942.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20178241 is about 4492.0197016487. The cubic root of 20178241 is about 272.2457455045.

The spelling of 20178241 in words is "twenty million, one hundred seventy-eight thousand, two hundred forty-one".