20461281 has 8 divisors (see below), whose sum is σ = 27423840. Its totient is φ = 13569792.

The previous prime is 20461279. The next prime is 20461297. The reversal of 20461281 is 18216402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20461281 - 2¹ = 20461279 is a prime.

It is a super-2 number, since 2×20461281² = 837328040321922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20461781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17091 + ... + 18248.

It is an arithmetic number, because the mean of its divisors is an integer number (3427980).

Almost surely, 2^20461281 is an apocalyptic number.

It is an amenable number.

20461281 is a deficient number, since it is larger than the sum of its proper divisors (6962559).

20461281 is a wasteful number, since it uses less digits than its factorization.

20461281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35535.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20461281 is about 4523.4147499428. The cubic root of 20461281 is about 273.5127691846.

Adding to 20461281 its reverse (18216402), we get a palindrome (38677683).

The spelling of 20461281 in words is "twenty million, four hundred sixty-one thousand, two hundred eighty-one".