20540235 has 32 divisors (see below), whose sum is σ = 34997760. Its totient is φ = 10257408.

The previous prime is 20540231. The next prime is 20540239. The reversal of 20540235 is 53204502.

It is an interprime number because it is at equal distance from previous prime (20540231) and next prime (20540239).

It is not a de Polignac number, because 20540235 - 2² = 20540231 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 27274 + ... + 28016.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^20540235 is an apocalyptic number.

20540235 is a deficient number, since it is larger than the sum of its proper divisors (14457525).

20540235 is a wasteful number, since it uses less digits than its factorization.

20540235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20540235 is about 4532.1336035029. The cubic root of 20540235 is about 273.8641191389.

Adding to 20540235 its reverse (53204502), we get a palindrome (73744737).

The spelling of 20540235 in words is "twenty million, five hundred forty thousand, two hundred thirty-five".