20408453 has 8 divisors (see below), whose sum is σ = 22288896. Its totient is φ = 18572400.

The previous prime is 20408419. The next prime is 20408459. The reversal of 20408453 is 35480402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20408453 - 2⁶ = 20408389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10133 + ... + 11978.

It is an arithmetic number, because the mean of its divisors is an integer number (2786112).

Almost surely, 2^20408453 is an apocalyptic number.

It is an amenable number.

20408453 is a deficient number, since it is larger than the sum of its proper divisors (1880443).

20408453 is a wasteful number, since it uses less digits than its factorization.

20408453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22195.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 20408453 is about 4517.5715821667. The cubic root of 20408453 is about 273.2771764796.

Adding to 20408453 its reverse (35480402), we get a palindrome (55888855).

The spelling of 20408453 in words is "twenty million, four hundred eight thousand, four hundred fifty-three".