20054281 has 8 divisors (see below), whose sum is σ = 21840840. Its totient is φ = 18302592.

The previous prime is 20054273. The next prime is 20054317. The reversal of 20054281 is 18245002.

20054281 = 130² + 131² + ... + 396².

It can be written as a sum of positive squares in 4 ways, for example, as 1210000 + 18844281 = 1100^2 + 4341^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20054281 - 2³ = 20054273 is a prime.

It is a super-2 number, since 2×20054281² = 804348372853922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20054201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7510 + ... + 9823.

It is an arithmetic number, because the mean of its divisors is an integer number (2730105).

Almost surely, 2^20054281 is an apocalyptic number.

It is an amenable number.

20054281 is a deficient number, since it is larger than the sum of its proper divisors (1786559).

20054281 is a wasteful number, since it uses less digits than its factorization.

20054281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17435.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20054281 is about 4478.2006431155. The cubic root of 20054281 is about 271.6871086696.

Adding to 20054281 its reverse (18245002), we get a palindrome (38299283).

The spelling of 20054281 in words is "twenty million, fifty-four thousand, two hundred eighty-one".