20153281 has 8 divisors (see below), whose sum is σ = 21258720. Its totient is φ = 19052352.

The previous prime is 20153251. The next prime is 20153291. The reversal of 20153281 is 18235102.

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 20153281 - 2⁷ = 20153153 is a prime.

It is a super-2 number, since 2×20153281² = 812309470129922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20153201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12201 + ... + 13753.

It is an arithmetic number, because the mean of its divisors is an integer number (2657340).

Almost surely, 2^20153281 is an apocalyptic number.

It is an amenable number.

20153281 is a deficient number, since it is larger than the sum of its proper divisors (1105439).

20153281 is a wasteful number, since it uses less digits than its factorization.

20153281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20153281 is about 4489.2405816574. The cubic root of 20153281 is about 272.1334453691.

Adding to 20153281 its reverse (18235102), we get a palindrome (38388383).

The spelling of 20153281 in words is "twenty million, one hundred fifty-three thousand, two hundred eighty-one".