20243131 has 4 divisors (see below), whose sum is σ = 20941200. Its totient is φ = 19545064.

The previous prime is 20243117. The next prime is 20243137. The reversal of 20243131 is 13134202.

It is a happy number.

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 20243131 - 2²³ = 11854523 is a prime.

It is a super-2 number, since 2×20243131² = 819568705366322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20243137) 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, 348991 + ... + 349048.

It is an arithmetic number, because the mean of its divisors is an integer number (5235300).

Almost surely, 2^20243131 is an apocalyptic number.

20243131 is a deficient number, since it is larger than the sum of its proper divisors (698069).

20243131 is an equidigital number, since it uses as much as digits as its factorization.

20243131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698068.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20243131 is about 4499.2367130437. The cubic root of 20243131 is about 272.5372661768.

Adding to 20243131 its reverse (13134202), we get a palindrome (33377333).

The spelling of 20243131 in words is "twenty million, two hundred forty-three thousand, one hundred thirty-one".