20649453 has 16 divisors (see below), whose sum is σ = 30217536. Its totient is φ = 12439040.

The previous prime is 20649451. The next prime is 20649481. The reversal of 20649453 is 35494602.

It is a cyclic number.

It is not a de Polignac number, because 20649453 - 2¹ = 20649451 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20649451) 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, 3901 + ... + 7517.

It is an arithmetic number, because the mean of its divisors is an integer number (1888596).

Almost surely, 2^20649453 is an apocalyptic number.

It is an amenable number.

20649453 is a deficient number, since it is larger than the sum of its proper divisors (9568083).

20649453 is a wasteful number, since it uses less digits than its factorization.

20649453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 20649453 is about 4544.1669203496. The cubic root of 20649453 is about 274.3486645956.

The spelling of 20649453 in words is "twenty million, six hundred forty-nine thousand, four hundred fifty-three".