20662445 has 4 divisors (see below), whose sum is σ = 24794940. Its totient is φ = 16529952.

The previous prime is 20662423. The next prime is 20662451. The reversal of 20662445 is 54426602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4251844 + 16410601 = 2062^2 + 4051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20662445 - 2⁶ = 20662381 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 3 ways as a sum of consecutive naturals, for example, 2066240 + ... + 2066249.

It is an arithmetic number, because the mean of its divisors is an integer number (6198735).

Almost surely, 2^20662445 is an apocalyptic number.

It is an amenable number.

20662445 is a deficient number, since it is larger than the sum of its proper divisors (4132495).

20662445 is an equidigital number, since it uses as much as digits as its factorization.

20662445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132494.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20662445 is about 4545.5962205194. The cubic root of 20662445 is about 274.4061897770.

The spelling of 20662445 in words is "twenty million, six hundred sixty-two thousand, four hundred forty-five".