20502445 has 4 divisors (see below), whose sum is σ = 24602940. Its totient is φ = 16401952.

The previous prime is 20502401. The next prime is 20502479. The reversal of 20502445 is 54420502.

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 13564489 + 6937956 = 3683^2 + 2634^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502445 - 2¹¹ = 20500397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050240 + ... + 2050249.

It is an arithmetic number, because the mean of its divisors is an integer number (6150735).

Almost surely, 2^20502445 is an apocalyptic number.

It is an amenable number.

20502445 is a deficient number, since it is larger than the sum of its proper divisors (4100495).

20502445 is an equidigital number, since it uses as much as digits as its factorization.

20502445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100494.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20502445 is about 4527.9625660997. The cubic root of 20502445 is about 273.6960639622.

Adding to 20502445 its reverse (54420502), we get a palindrome (74922947).

It can be divided in two parts, 20 and 502445, that multiplied together give a square (10048900 = 3170²).

The spelling of 20502445 in words is "twenty million, five hundred two thousand, four hundred forty-five".