20103731 has 4 divisors (see below), whose sum is σ = 20132112. Its totient is φ = 20075352.

The previous prime is 20103701. The next prime is 20103737. The reversal of 20103731 is 13730102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13730102 = 2 ⋅6865051.

It is a cyclic number.

It is not a de Polignac number, because 20103731 - 2⁶ = 20103667 is a prime.

It is a super-2 number, since 2×20103731² = 808320000240722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13100 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (5033028).

Almost surely, 2^20103731 is an apocalyptic number.

20103731 is a deficient number, since it is larger than the sum of its proper divisors (28381).

20103731 is an equidigital number, since it uses as much as digits as its factorization.

20103731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28380.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 20103731 is about 4483.7184345139. The cubic root of 20103731 is about 271.9102347605.

Adding to 20103731 its reverse (13730102), we get a palindrome (33833833).

The spelling of 20103731 in words is "twenty million, one hundred three thousand, seven hundred thirty-one".