20280131 has 4 divisors (see below), whose sum is σ = 20304600. Its totient is φ = 20255664.

The previous prime is 20280119. The next prime is 20280149. The reversal of 20280131 is 13108202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13108202 = 2 ⋅6554101.

It is a cyclic number.

It is not a de Polignac number, because 20280131 - 2⁶ = 20280067 is a prime.

It is a super-2 number, since 2×20280131² = 822567426754322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20280101) 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 3 ways as a sum of consecutive naturals, for example, 10946 + ... + 12663.

It is an arithmetic number, because the mean of its divisors is an integer number (5076150).

Almost surely, 2^20280131 is an apocalyptic number.

20280131 is a deficient number, since it is larger than the sum of its proper divisors (24469).

20280131 is an equidigital number, since it uses as much as digits as its factorization.

20280131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24468.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20280131 is about 4503.3466444412. The cubic root of 20280131 is about 272.7032112139.

Adding to 20280131 its reverse (13108202), we get a palindrome (33388333).

The spelling of 20280131 in words is "twenty million, two hundred eighty thousand, one hundred thirty-one".