20540455 has 16 divisors (see below), whose sum is σ = 27165600. Its totient is φ = 14813568.

The previous prime is 20540453. The next prime is 20540459. The reversal of 20540455 is 55404502.

It is a cyclic number.

It is not a de Polignac number, because 20540455 - 2¹ = 20540453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 880 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (1697850).

Almost surely, 2^20540455 is an apocalyptic number.

20540455 is a deficient number, since it is larger than the sum of its proper divisors (6625145).

20540455 is a wasteful number, since it uses less digits than its factorization.

20540455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20540455 is about 4532.1578745670. The cubic root of 20540455 is about 273.8650968929.

Adding to 20540455 its reverse (55404502), we get a palindrome (75944957).

The spelling of 20540455 in words is "twenty million, five hundred forty thousand, four hundred fifty-five".