20378453 has 8 divisors (see below), whose sum is σ = 21274680. Its totient is φ = 19500480.

The previous prime is 20378441. The next prime is 20378473. The reversal of 20378453 is 35487302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8254129 + 12124324 = 2873^2 + 3482^2 .

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

It is not a de Polignac number, because 20378453 - 2⁶ = 20378389 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 (20378473) 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, 2258 + ... + 6771.

It is an arithmetic number, because the mean of its divisors is an integer number (2659335).

Almost surely, 2^20378453 is an apocalyptic number.

It is an amenable number.

20378453 is a deficient number, since it is larger than the sum of its proper divisors (896227).

20378453 is an equidigital number, since it uses as much as digits as its factorization.

20378453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9127.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20378453 is about 4514.2499930775. The cubic root of 20378453 is about 273.1432068986.

The spelling of 20378453 in words is "twenty million, three hundred seventy-eight thousand, four hundred fifty-three".