20442245 has 16 divisors (see below), whose sum is σ = 26872560. Its totient is φ = 14859264.

The previous prime is 20442203. The next prime is 20442269. The reversal of 20442245 is 54224402.

It can be written as a sum of positive squares in 8 ways, for example, as 75076 + 20367169 = 274^2 + 4513^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442245 - 2²⁴ = 3665029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20442245.

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, 1682 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (1679535).

Almost surely, 2^20442245 is an apocalyptic number.

It is an amenable number.

20442245 is a deficient number, since it is larger than the sum of its proper divisors (6430315).

20442245 is a wasteful number, since it uses less digits than its factorization.

20442245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8344.

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 20442245 is about 4521.3100977482. The cubic root of 20442245 is about 273.4279226795.

Adding to 20442245 its reverse (54224402), we get a palindrome (74666647).

The spelling of 20442245 in words is "twenty million, four hundred forty-two thousand, two hundred forty-five".