20103681 has 16 divisors (see below), whose sum is σ = 29005760. Its totient is φ = 12312000.

The previous prime is 20103667. The next prime is 20103697. The reversal of 20103681 is 18630102.

It is not a de Polignac number, because 20103681 - 2⁷ = 20103553 is a prime.

It is a super-2 number, since 2×20103681² = 808315979499522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7806 + ... + 10056.

It is an arithmetic number, because the mean of its divisors is an integer number (1812860).

Almost surely, 2^20103681 is an apocalyptic number.

It is an amenable number.

20103681 is a deficient number, since it is larger than the sum of its proper divisors (8902079).

20103681 is a wasteful number, since it uses less digits than its factorization.

20103681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496.

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

The square root of 20103681 is about 4483.7128587812. The cubic root of 20103681 is about 271.9100093376.

Adding to 20103681 its reverse (18630102), we get a palindrome (38733783).

The spelling of 20103681 in words is "twenty million, one hundred three thousand, six hundred eighty-one".