20006446 has 4 divisors (see below), whose sum is σ = 30009672. Its totient is φ = 10003222.

The previous prime is 20006431. The next prime is 20006489. The reversal of 20006446 is 64460002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64460002 = 2 ⋅32230001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001610 + ... + 5001613.

It is an arithmetic number, because the mean of its divisors is an integer number (7502418).

Almost surely, 2^20006446 is an apocalyptic number.

20006446 is a deficient number, since it is larger than the sum of its proper divisors (10003226).

20006446 is a wasteful number, since it uses less digits than its factorization.

20006446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10003225.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20006446 is about 4472.8565816489. The cubic root of 20006446 is about 271.4709204204.

Adding to 20006446 its reverse (64460002), we get a palindrome (84466448).

The spelling of 20006446 in words is "twenty million, six thousand, four hundred forty-six".