20540345 has 16 divisors (see below), whose sum is σ = 28397568. Its totient is φ = 13970880.

The previous prime is 20540341. The next prime is 20540353. The reversal of 20540345 is 54304502.

It is not a de Polignac number, because 20540345 - 2² = 20540341 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 20540345.

It is not an unprimeable number, because it can be changed into a prime (20540341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2135 + ... + 6755.

It is an arithmetic number, because the mean of its divisors is an integer number (1774848).

Almost surely, 2^20540345 is an apocalyptic number.

It is an amenable number.

20540345 is a deficient number, since it is larger than the sum of its proper divisors (7857223).

20540345 is a wasteful number, since it uses less digits than its factorization.

20540345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4760.

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

The square root of 20540345 is about 4532.1457390512. The cubic root of 20540345 is about 273.8646080168.

Adding to 20540345 its reverse (54304502), we get a palindrome (74844847).

The spelling of 20540345 in words is "twenty million, five hundred forty thousand, three hundred forty-five".