20645373 has 8 divisors (see below), whose sum is σ = 31459648. Its totient is φ = 11797344.

The previous prime is 20645347. The next prime is 20645399. The reversal of 20645373 is 37354602.

It is an interprime number because it is at equal distance from previous prime (20645347) and next prime (20645399).

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

It is not a de Polignac number, because 20645373 - 2⁵ = 20645341 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20645373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655373) 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, 491536 + ... + 491577.

It is an arithmetic number, because the mean of its divisors is an integer number (3932456).

Almost surely, 2^20645373 is an apocalyptic number.

It is an amenable number.

20645373 is a deficient number, since it is larger than the sum of its proper divisors (10814275).

20645373 is an equidigital number, since it uses as much as digits as its factorization.

20645373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983123.

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 20645373 is about 4543.7179710013. The cubic root of 20645373 is about 274.3305944433.

Adding to 20645373 its reverse (37354602), we get a palindrome (57999975).

The spelling of 20645373 in words is "twenty million, six hundred forty-five thousand, three hundred seventy-three".