20445293 has 4 divisors (see below), whose sum is σ = 22303968. Its totient is φ = 18586620.

The previous prime is 20445289. The next prime is 20445317. The reversal of 20445293 is 39254402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20445293 - 2² = 20445289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929321 + ... + 929342.

It is an arithmetic number, because the mean of its divisors is an integer number (5575992).

Almost surely, 2^20445293 is an apocalyptic number.

It is an amenable number.

20445293 is a deficient number, since it is larger than the sum of its proper divisors (1858675).

20445293 is a wasteful number, since it uses less digits than its factorization.

20445293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858674.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20445293 is about 4521.6471556281. The cubic root of 20445293 is about 273.4415116451.

Adding to 20445293 its reverse (39254402), we get a palindrome (59699695).

It can be divided in two parts, 2044 and 5293, that added together give a palindrome (7337).

The spelling of 20445293 in words is "twenty million, four hundred forty-five thousand, two hundred ninety-three".