20457445 has 16 divisors (see below), whose sum is σ = 25263360. Its totient is φ = 15897024.

The previous prime is 20457431. The next prime is 20457461. The reversal of 20457445 is 54475402.

It is a cyclic number.

It is not a de Polignac number, because 20457445 - 2⁵ = 20457413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26079 + ... + 26851.

It is an arithmetic number, because the mean of its divisors is an integer number (1578960).

Almost surely, 2^20457445 is an apocalyptic number.

It is an amenable number.

20457445 is a deficient number, since it is larger than the sum of its proper divisors (4805915).

20457445 is an equidigital number, since it uses as much as digits as its factorization.

20457445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 20457445 is about 4522.9907141183. The cubic root of 20457445 is about 273.4956757524.

It can be divided in two parts, 20457 and 445, that added together give a palindrome (20902).

The spelling of 20457445 in words is "twenty million, four hundred fifty-seven thousand, four hundred forty-five".