20381461 has 4 divisors (see below), whose sum is σ = 21084300. Its totient is φ = 19678624.

The previous prime is 20381443. The next prime is 20381479. The reversal of 20381461 is 16418302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16418302 = 2 ⋅8209151.

It is an interprime number because it is at equal distance from previous prime (20381443) and next prime (20381479).

It can be written as a sum of positive squares in 2 ways, for example, as 12006225 + 8375236 = 3465^2 + 2894^2 .

It is a cyclic number.

It is not a de Polignac number, because 20381461 - 2¹⁷ = 20250389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381401) 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, 351376 + ... + 351433.

It is an arithmetic number, because the mean of its divisors is an integer number (5271075).

Almost surely, 2^20381461 is an apocalyptic number.

It is an amenable number.

20381461 is a deficient number, since it is larger than the sum of its proper divisors (702839).

20381461 is an equidigital number, since it uses as much as digits as its factorization.

20381461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702838.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20381461 is about 4514.5831479772. The cubic root of 20381461 is about 273.1566455102.

Adding to 20381461 its reverse (16418302), we get a palindrome (36799763).

The spelling of 20381461 in words is "twenty million, three hundred eighty-one thousand, four hundred sixty-one".