20000031 has 16 divisors (see below), whose sum is σ = 27460224. Its totient is φ = 12940704.

The previous prime is 20000023. The next prime is 20000033. The reversal of 20000031 is 13000002.

It is not a de Polignac number, because 20000031 - 2³ = 20000023 is a prime.

It is a super-2 number, since 2×20000031² = 800002480001922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19999974 and 20000019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000033) 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 15 ways as a sum of consecutive naturals, for example, 25020 + ... + 25806.

It is an arithmetic number, because the mean of its divisors is an integer number (1716264).

Almost surely, 2^20000031 is an apocalyptic number.

20000031 is a deficient number, since it is larger than the sum of its proper divisors (7460193).

20000031 is a wasteful number, since it uses less digits than its factorization.

20000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 20000031 is about 4472.1394209036. The cubic root of 20000031 is about 271.4419019043.

Adding to 20000031 its reverse (13000002), we get a palindrome (33000033).

The spelling of 20000031 in words is "twenty million, thirty-one", and thus it is an aban number and an uban number.