20445446 has 12 divisors (see below), whose sum is σ = 35675388. Its totient is φ = 8762292.

The previous prime is 20445443. The next prime is 20445487. The reversal of 20445446 is 64454402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104216 + ... + 104411.

It is an arithmetic number, because the mean of its divisors is an integer number (2972949).

Almost surely, 2^20445446 is an apocalyptic number.

20445446 is a deficient number, since it is larger than the sum of its proper divisors (15229942).

20445446 is a wasteful number, since it uses less digits than its factorization.

20445446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208643 (or 208636 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 20445446 is about 4521.6640742098. The cubic root of 20445446 is about 273.4421937328.

Adding to 20445446 its reverse (64454402), we get a palindrome (84899848).

The spelling of 20445446 in words is "twenty million, four hundred forty-five thousand, four hundred forty-six".