20010131 has 4 divisors (see below), whose sum is σ = 20031792. Its totient is φ = 19988472.

The previous prime is 20010127. The next prime is 20010157. The reversal of 20010131 is 13101002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13101002 = 2 ⋅6550501.

It is a cyclic number.

It is not a de Polignac number, because 20010131 - 2² = 20010127 is a prime.

It is a super-2 number, since 2×20010131² = 800810685274322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015131) 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, 9380 + ... + 11313.

It is an arithmetic number, because the mean of its divisors is an integer number (5007948).

Almost surely, 2^20010131 is an apocalyptic number.

20010131 is a deficient number, since it is larger than the sum of its proper divisors (21661).

20010131 is an equidigital number, since it uses as much as digits as its factorization.

20010131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21660.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20010131 is about 4473.2684918301. The cubic root of 20010131 is about 271.4875868642.

Adding to 20010131 its reverse (13101002), we get a palindrome (33111133).

The spelling of 20010131 in words is "twenty million, ten thousand, one hundred thirty-one".