20894881 has 8 divisors (see below), whose sum is σ = 23910464. Its totient is φ = 17886960.

The previous prime is 20894869. The next prime is 20894911. The reversal of 20894881 is 18849802.

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

It is not a de Polignac number, because 20894881 - 2¹⁵ = 20862113 is a prime.

It is a super-2 number, since 2×20894881² = 873192104008322, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 20894881 parts by 6464 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20894681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6286 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (2988808).

Almost surely, 2^20894881 is an apocalyptic number.

It is an amenable number.

20894881 is a deficient number, since it is larger than the sum of its proper divisors (3015583).

20894881 is a wasteful number, since it uses less digits than its factorization.

20894881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 20894881 is about 4571.0918826906. The cubic root of 20894881 is about 275.4313055628.

The spelling of 20894881 in words is "twenty million, eight hundred ninety-four thousand, eight hundred eighty-one".