20010031 has 4 divisors (see below), whose sum is σ = 20029464. Its totient is φ = 19990600.

The previous prime is 20010017. The next prime is 20010041. The reversal of 20010031 is 13001002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20010031 - 2⁵ = 20009999 is a prime.

It is a super-2 number, since 2×20010031² = 800802681241922, 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 = 20009996 and 20010023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080 + ... + 10261.

It is an arithmetic number, because the mean of its divisors is an integer number (5007366).

Almost surely, 2^20010031 is an apocalyptic number.

20010031 is a deficient number, since it is larger than the sum of its proper divisors (19433).

20010031 is a wasteful number, since it uses less digits than its factorization.

20010031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19432.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 20010031 is about 4473.2573143069. The cubic root of 20010031 is about 271.4871346133.

Adding to 20010031 its reverse (13001002), we get a palindrome (33011033).

The spelling of 20010031 in words is "twenty million, ten thousand, thirty-one".