20040931 has 8 divisors (see below), whose sum is σ = 20517840. Its totient is φ = 19569792.

The previous prime is 20040929. The next prime is 20040959. The reversal of 20040931 is 13904002.

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 20040931 - 2¹ = 20040929 is a prime.

It is a super-2 number, since 2×20040931² = 803277830693522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20040899 and 20040908.

It is not an unprimeable number, because it can be changed into a prime (20040901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6031 + ... + 8743.

It is an arithmetic number, because the mean of its divisors is an integer number (2564730).

Almost surely, 2^20040931 is an apocalyptic number.

20040931 is a deficient number, since it is larger than the sum of its proper divisors (476909).

20040931 is an equidigital number, since it uses as much as digits as its factorization.

20040931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20040931 is about 4476.7098409435. The cubic root of 20040931 is about 271.6268085267.

Adding to 20040931 its reverse (13904002), we get a palindrome (33944933).

The spelling of 20040931 in words is "twenty million, forty thousand, nine hundred thirty-one".