20657245 has 8 divisors (see below), whose sum is σ = 28329984. Its totient is φ = 14164944.

The previous prime is 20657233. The next prime is 20657269. The reversal of 20657245 is 54275602.

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 20657245 - 2⁹ = 20656733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295069 + ... + 295138.

It is an arithmetic number, because the mean of its divisors is an integer number (3541248).

Almost surely, 2^20657245 is an apocalyptic number.

It is an amenable number.

20657245 is a deficient number, since it is larger than the sum of its proper divisors (7672739).

20657245 is an equidigital number, since it uses as much as digits as its factorization.

20657245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590219.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20657245 is about 4545.0242023558. The cubic root of 20657245 is about 274.3831684307.

It can be divided in two parts, 20657 and 245, that added together give a palindrome (20902).

The spelling of 20657245 in words is "twenty million, six hundred fifty-seven thousand, two hundred forty-five".