20445394 has 8 divisors (see below), whose sum is σ = 30740220. Its totient is φ = 10198656.

The previous prime is 20445361. The next prime is 20445427. The reversal of 20445394 is 49354402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20445361) and next prime (20445427).

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 3330625 = 4137^2 + 1825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 10939 + ... + 12670.

Almost surely, 2^20445394 is an apocalyptic number.

20445394 is a deficient number, since it is larger than the sum of its proper divisors (10294826).

20445394 is a wasteful number, since it uses less digits than its factorization.

20445394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24044.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20445394 is about 4521.6583241107. The cubic root of 20445394 is about 273.4419619125.

Adding to 20445394 its reverse (49354402), we get a palindrome (69799796).

The spelling of 20445394 in words is "twenty million, four hundred forty-five thousand, three hundred ninety-four".