20301681 has 8 divisors (see below), whose sum is σ = 27141120. Its totient is φ = 13498352.

The previous prime is 20301647. The next prime is 20301691. The reversal of 20301681 is 18610302.

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 20301681 - 2¹⁹ = 19777393 is a prime.

It is a super-2 number, since 2×20301681² = 824316502851522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20301691) 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, 7686 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (3392640).

Almost surely, 2^20301681 is an apocalyptic number.

It is an amenable number.

20301681 is a deficient number, since it is larger than the sum of its proper divisors (6839439).

20301681 is a wasteful number, since it uses less digits than its factorization.

20301681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20301681 is about 4505.7386741799. The cubic root of 20301681 is about 272.7997699895.

Adding to 20301681 its reverse (18610302), we get a palindrome (38911983).

The spelling of 20301681 in words is "twenty million, three hundred one thousand, six hundred eighty-one".