20540435 has 4 divisors (see below), whose sum is σ = 24648528. Its totient is φ = 16432344.

The previous prime is 20540431. The next prime is 20540441. The reversal of 20540435 is 53404502.

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 20540435 - 2² = 20540431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20540435.

It is not an unprimeable number, because it can be changed into a prime (20540431) 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, 2054039 + ... + 2054048.

It is an arithmetic number, because the mean of its divisors is an integer number (6162132).

Almost surely, 2^20540435 is an apocalyptic number.

20540435 is a deficient number, since it is larger than the sum of its proper divisors (4108093).

20540435 is an equidigital number, since it uses as much as digits as its factorization.

20540435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108092.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20540435 is about 4532.1556681120. The cubic root of 20540435 is about 273.8650080065.

Adding to 20540435 its reverse (53404502), we get a palindrome (73944937).

The spelling of 20540435 in words is "twenty million, five hundred forty thousand, four hundred thirty-five".