20102881 has 4 divisors (see below), whose sum is σ = 20402992. Its totient is φ = 19802772.

The previous prime is 20102861. The next prime is 20102899. The reversal of 20102881 is 18820102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20102881 - 2¹³ = 20094689 is a prime.

It is a super-2 number, since 2×20102881² = 808251649000322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102821) 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, 149955 + ... + 150088.

It is an arithmetic number, because the mean of its divisors is an integer number (5100748).

Almost surely, 2^20102881 is an apocalyptic number.

It is an amenable number.

20102881 is a deficient number, since it is larger than the sum of its proper divisors (300111).

20102881 is an equidigital number, since it uses as much as digits as its factorization.

20102881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300110.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20102881 is about 4483.6236461148. The cubic root of 20102881 is about 271.9064025206.

Adding to 20102881 its reverse (18820102), we get a palindrome (38922983).

The spelling of 20102881 in words is "twenty million, one hundred two thousand, eight hundred eighty-one".