20120131 has 4 divisors (see below), whose sum is σ = 20225664. Its totient is φ = 20014600.

The previous prime is 20120081. The next prime is 20120143. The reversal of 20120131 is 13102102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120131 is a prime.

It is a super-2 number, since 2×20120131² = 809639342914322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120161) 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, 52480 + ... + 52861.

It is an arithmetic number, because the mean of its divisors is an integer number (5056416).

Almost surely, 2^20120131 is an apocalyptic number.

20120131 is a deficient number, since it is larger than the sum of its proper divisors (105533).

20120131 is a wasteful number, since it uses less digits than its factorization.

20120131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105532.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20120131 is about 4485.5469008806. The cubic root of 20120131 is about 271.9841533083.

Adding to 20120131 its reverse (13102102), we get a palindrome (33222233).

The spelling of 20120131 in words is "twenty million, one hundred twenty thousand, one hundred thirty-one".