20450131 has 4 divisors (see below), whose sum is σ = 22023232. Its totient is φ = 18877032.

The previous prime is 20450117. The next prime is 20450141. The reversal of 20450131 is 13105402.

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-20450131 is a prime.

It is a super-2 number, since 2×20450131² = 836415715834322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20450141) 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, 786531 + ... + 786556.

It is an arithmetic number, because the mean of its divisors is an integer number (5505808).

Almost surely, 2^20450131 is an apocalyptic number.

20450131 is a deficient number, since it is larger than the sum of its proper divisors (1573101).

20450131 is a wasteful number, since it uses less digits than its factorization.

20450131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573100.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20450131 is about 4522.1821060192. The cubic root of 20450131 is about 273.4630782342.

Adding to 20450131 its reverse (13105402), we get a palindrome (33555533).

The spelling of 20450131 in words is "twenty million, four hundred fifty thousand, one hundred thirty-one".