20065881 has 16 divisors (see below), whose sum is σ = 30723840. Its totient is φ = 11520720.

The previous prime is 20065849. The next prime is 20065909. The reversal of 20065881 is 18856002.

It is not a de Polignac number, because 20065881 - 2⁵ = 20065849 is a prime.

It is a super-2 number, since 2×20065881² = 805279160612322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20065811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15375 + ... + 16628.

It is an arithmetic number, because the mean of its divisors is an integer number (1920240).

Almost surely, 2^20065881 is an apocalyptic number.

It is an amenable number.

20065881 is a deficient number, since it is larger than the sum of its proper divisors (10657959).

20065881 is a wasteful number, since it uses less digits than its factorization.

20065881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32036.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 20065881 is about 4479.4956189285. The cubic root of 20065881 is about 271.7394825742.

It can be divided in two parts, 2006 and 5881, that added together give a palindrome (7887).

The spelling of 20065881 in words is "twenty million, sixty-five thousand, eight hundred eighty-one".