20540031 has 4 divisors (see below), whose sum is σ = 27386712. Its totient is φ = 13693352.

The previous prime is 20540017. The next prime is 20540053. The reversal of 20540031 is 13004502.

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 20540031 - 2¹³ = 20531839 is a prime.

It is a super-2 number, since 2×20540031² = 843785746961922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540231) 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, 3423336 + ... + 3423341.

It is an arithmetic number, because the mean of its divisors is an integer number (6846678).

Almost surely, 2^20540031 is an apocalyptic number.

20540031 is a deficient number, since it is larger than the sum of its proper divisors (6846681).

20540031 is an equidigital number, since it uses as much as digits as its factorization.

20540031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6846680.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20540031 is about 4532.1110974909. Note that the first 3 decimals coincide. The cubic root of 20540031 is about 273.8632124881.

Adding to 20540031 its reverse (13004502), we get a palindrome (33544533).

The spelling of 20540031 in words is "twenty million, five hundred forty thousand, thirty-one".