20622845 has 4 divisors (see below), whose sum is σ = 24747420. Its totient is φ = 16498272.

The previous prime is 20622841. The next prime is 20622851. The reversal of 20622845 is 54822602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54822602 = 2 ⋅27411301.

It can be written as a sum of positive squares in 2 ways, for example, as 12630916 + 7991929 = 3554^2 + 2827^2 .

It is a cyclic number.

It is not a de Polignac number, because 20622845 - 2² = 20622841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20622841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062280 + ... + 2062289.

It is an arithmetic number, because the mean of its divisors is an integer number (6186855).

Almost surely, 2^20622845 is an apocalyptic number.

It is an amenable number.

20622845 is a deficient number, since it is larger than the sum of its proper divisors (4124575).

20622845 is an equidigital number, since it uses as much as digits as its factorization.

20622845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124574.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 20622845 is about 4541.2382672571. The cubic root of 20622845 is about 274.2307759693.

The spelling of 20622845 in words is "twenty million, six hundred twenty-two thousand, eight hundred forty-five".