20504445 has 32 divisors (see below), whose sum is σ = 35852544. Its totient is φ = 9945600.

The previous prime is 20504437. The next prime is 20504453. The reversal of 20504445 is 54440502.

It is an interprime number because it is at equal distance from previous prime (20504437) and next prime (20504453).

It is not a de Polignac number, because 20504445 - 2³ = 20504437 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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13105 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^20504445 is an apocalyptic number.

It is an amenable number.

20504445 is a deficient number, since it is larger than the sum of its proper divisors (15348099).

20504445 is a wasteful number, since it uses less digits than its factorization.

20504445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 20504445 is about 4528.1834105964. The cubic root of 20504445 is about 273.7049632964.

Adding to 20504445 its reverse (54440502), we get a palindrome (74944947).

The spelling of 20504445 in words is "twenty million, five hundred four thousand, four hundred forty-five".