20335681 has 8 divisors (see below), whose sum is σ = 21985280. Its totient is φ = 18744048.

The previous prime is 20335673. The next prime is 20335687. The reversal of 20335681 is 18653302.

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

It is a cyclic number.

It is not a de Polignac number, because 20335681 - 2³ = 20335673 is a prime.

It is a super-2 number, since 2×20335681² = 827079843467522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20335687) 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, 13761 + ... + 15166.

It is an arithmetic number, because the mean of its divisors is an integer number (2748160).

Almost surely, 2^20335681 is an apocalyptic number.

It is an amenable number.

20335681 is a deficient number, since it is larger than the sum of its proper divisors (1649599).

20335681 is a wasteful number, since it uses less digits than its factorization.

20335681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28983.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20335681 is about 4509.5100620799. The cubic root of 20335681 is about 272.9519744490.

Adding to 20335681 its reverse (18653302), we get a palindrome (38988983).

The spelling of 20335681 in words is "twenty million, three hundred thirty-five thousand, six hundred eighty-one".