20081031 has 8 divisors (see below), whose sum is σ = 26795760. Its totient is φ = 13376832.

The previous prime is 20081027. The next prime is 20081041. The reversal of 20081031 is 13018002.

It is a happy number.

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

It is not a de Polignac number, because 20081031 - 2² = 20081027 is a prime.

It is a super-2 number, since 2×20081031² = 806495612045922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20081031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20081041) 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, 4905 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (3349470).

Almost surely, 2^20081031 is an apocalyptic number.

20081031 is a deficient number, since it is larger than the sum of its proper divisors (6714729).

20081031 is a wasteful number, since it uses less digits than its factorization.

20081031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5265.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20081031 is about 4481.1863384599. The cubic root of 20081031 is about 271.8078543127.

Adding to 20081031 its reverse (13018002), we get a palindrome (33099033).

The spelling of 20081031 in words is "twenty million, eighty-one thousand, thirty-one".