20622545 has 4 divisors (see below), whose sum is σ = 24747060. Its totient is φ = 16498032.

The previous prime is 20622529. The next prime is 20622583. The reversal of 20622545 is 54522602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54522602 = 2 ⋅27261301.

It can be written as a sum of positive squares in 2 ways, for example, as 6190144 + 14432401 = 2488^2 + 3799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20622545 - 2⁴ = 20622529 is a prime.

It is a Curzon 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, 2062250 + ... + 2062259.

It is an arithmetic number, because the mean of its divisors is an integer number (6186765).

Almost surely, 2^20622545 is an apocalyptic number.

It is an amenable number.

20622545 is a deficient number, since it is larger than the sum of its proper divisors (4124515).

20622545 is an equidigital number, since it uses as much as digits as its factorization.

20622545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124514.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20622545 is about 4541.2052364983. The cubic root of 20622545 is about 274.2294462201.

The spelling of 20622545 in words is "twenty million, six hundred twenty-two thousand, five hundred forty-five".