20645273 has 8 divisors (see below), whose sum is σ = 22559040. Its totient is φ = 18737680.

The previous prime is 20645269. The next prime is 20645281. The reversal of 20645273 is 37254602.

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 20645273 - 2² = 20645269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20642273) 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, 8111 + ... + 10347.

It is an arithmetic number, because the mean of its divisors is an integer number (2819880).

Almost surely, 2^20645273 is an apocalyptic number.

It is an amenable number.

20645273 is a deficient number, since it is larger than the sum of its proper divisors (1913767).

20645273 is a wasteful number, since it uses less digits than its factorization.

20645273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20645273 is about 4543.7069667838. The cubic root of 20645273 is about 274.3301515175.

Adding to 20645273 its reverse (37254602), we get a palindrome (57899875).

It can be divided in two parts, 2064 and 5273, that added together give a palindrome (7337).

The spelling of 20645273 in words is "twenty million, six hundred forty-five thousand, two hundred seventy-three".