20101281 has 8 divisors (see below), whose sum is σ = 26863200. Its totient is φ = 13370112.

The previous prime is 20101261. The next prime is 20101283. The reversal of 20101281 is 18210102.

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

It is not a de Polignac number, because 20101281 - 2¹⁰ = 20100257 is a prime.

It is a super-2 number, since 2×20101281² = 808122995681922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20101281.

It is not an unprimeable number, because it can be changed into a prime (20101283) 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, 6115 + ... + 8808.

It is an arithmetic number, because the mean of its divisors is an integer number (3357900).

Almost surely, 2^20101281 is an apocalyptic number.

It is an amenable number.

20101281 is a deficient number, since it is larger than the sum of its proper divisors (6761919).

20101281 is a wasteful number, since it uses less digits than its factorization.

20101281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15375.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 20101281 is about 4483.4452154565. The cubic root of 20101281 is about 271.8991885996.

Adding to 20101281 its reverse (18210102), we get a palindrome (38311383).

The spelling of 20101281 in words is "twenty million, one hundred one thousand, two hundred eighty-one".