20389241 has 4 divisors (see below), whose sum is σ = 20422800. Its totient is φ = 20355684.

The previous prime is 20389231. The next prime is 20389249. The reversal of 20389241 is 14298302.

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 a de Polignac number, because none of the positive numbers 2^k-20389241 is a prime.

It is a super-2 number, since 2×20389241² = 831442297112162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20389249) 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, 15851 + ... + 17088.

It is an arithmetic number, because the mean of its divisors is an integer number (5105700).

Almost surely, 2^20389241 is an apocalyptic number.

It is an amenable number.

20389241 is a deficient number, since it is larger than the sum of its proper divisors (33559).

20389241 is an equidigital number, since it uses as much as digits as its factorization.

20389241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33558.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20389241 is about 4515.4447178545. Note that the first 3 decimals coincide. The cubic root of 20389241 is about 273.1913974898.

The spelling of 20389241 in words is "twenty million, three hundred eighty-nine thousand, two hundred forty-one".