20340455 has 16 divisors (see below), whose sum is σ = 25444800. Its totient is φ = 15590400.

The previous prime is 20340451. The next prime is 20340457. The reversal of 20340455 is 55404302.

It is not a de Polignac number, because 20340455 - 2² = 20340451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20340455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340451) 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, 21431 + ... + 22359.

It is an arithmetic number, because the mean of its divisors is an integer number (1590300).

Almost surely, 2^20340455 is an apocalyptic number.

20340455 is a deficient number, since it is larger than the sum of its proper divisors (5104345).

20340455 is a wasteful number, since it uses less digits than its factorization.

20340455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114.

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

The square root of 20340455 is about 4510.0393568128. The cubic root of 20340455 is about 272.9733321596.

Adding to 20340455 its reverse (55404302), we get a palindrome (75744757).

The spelling of 20340455 in words is "twenty million, three hundred forty thousand, four hundred fifty-five".