20064481 has 2 divisors, whose sum is σ = 20064482. Its totient is φ = 20064480.

The previous prime is 20064479. The next prime is 20064493. The reversal of 20064481 is 18446002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 2298256 = 4215^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 20064481 - 2¹ = 20064479 is a prime.

It is a super-2 number, since 2×20064481² = 805166795598722, which contains 22 as substring.

Together with 20064479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20064431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10032240 + 10032241.

It is an arithmetic number, because the mean of its divisors is an integer number (10032241).

Almost surely, 2^20064481 is an apocalyptic number.

It is an amenable number.

20064481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20064481 is an equidigital number, since it uses as much as digits as its factorization.

20064481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20064481 is about 4479.3393486093. The cubic root of 20064481 is about 271.7331626569.

Subtracting from 20064481 its product of nonzero digits (1536), we obtain a triangular number (20062945 = T₆₃₃₄).

The spelling of 20064481 in words is "twenty million, sixty-four thousand, four hundred eighty-one".