20544455 has 4 divisors (see below), whose sum is σ = 24653352. Its totient is φ = 16435560.

The previous prime is 20544439. The next prime is 20544473. The reversal of 20544455 is 55444502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20544455 - 2⁴ = 20544439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054441 + ... + 2054450.

It is an arithmetic number, because the mean of its divisors is an integer number (6163338).

Almost surely, 2^20544455 is an apocalyptic number.

20544455 is a deficient number, since it is larger than the sum of its proper divisors (4108897).

20544455 is an equidigital number, since it uses as much as digits as its factorization.

20544455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108896.

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 20544455 is about 4532.5991439791. The cubic root of 20544455 is about 273.8828730212.

Adding to 20544455 its reverse (55444502), we get a palindrome (75988957).

The spelling of 20544455 in words is "twenty million, five hundred forty-four thousand, four hundred fifty-five".