20453445 has 16 divisors (see below), whose sum is σ = 36361920. Its totient is φ = 10908432.

The previous prime is 20453437. The next prime is 20453453. The reversal of 20453445 is 54435402.

It is an interprime number because it is at equal distance from previous prime (20453437) and next prime (20453453).

It is not a de Polignac number, because 20453445 - 2³ = 20453437 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75619 + ... + 75888.

It is an arithmetic number, because the mean of its divisors is an integer number (2272620).

Almost surely, 2^20453445 is an apocalyptic number.

It is an amenable number.

20453445 is a deficient number, since it is larger than the sum of its proper divisors (15908475).

20453445 is a wasteful number, since it uses less digits than its factorization.

20453445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151521 (or 151515 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 20453445 is about 4522.5485072025. The cubic root of 20453445 is about 273.4778492511.

Adding to 20453445 its reverse (54435402), we get a palindrome (74888847).

The spelling of 20453445 in words is "twenty million, four hundred fifty-three thousand, four hundred forty-five".