20964081 has 8 divisors (see below), whose sum is σ = 28033600. Its totient is φ = 13935312.

The previous prime is 20964059. The next prime is 20964103. The reversal of 20964081 is 18046902.

It is an interprime number because it is at equal distance from previous prime (20964059) and next prime (20964103).

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

It is not a de Polignac number, because 20964081 - 2¹¹ = 20962033 is a prime.

It is a super-2 number, since 2×20964081² = 878985384349122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20964001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8965 + ... + 11058.

It is an arithmetic number, because the mean of its divisors is an integer number (3504200).

Almost surely, 2^20964081 is an apocalyptic number.

It is an amenable number.

20964081 is a deficient number, since it is larger than the sum of its proper divisors (7069519).

20964081 is a wasteful number, since it uses less digits than its factorization.

20964081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20375.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20964081 is about 4578.6549334930. The cubic root of 20964081 is about 275.7350297792.

The spelling of 20964081 in words is "twenty million, nine hundred sixty-four thousand, eighty-one".