20445546 has 16 divisors (see below), whose sum is σ = 44608608. Its totient is φ = 6195600.

The previous prime is 20445541. The next prime is 20445583. The reversal of 20445546 is 64554402.

It is not an unprimeable number, because it can be changed into a prime (20445541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154825 + ... + 154956.

It is an arithmetic number, because the mean of its divisors is an integer number (2788038).

Almost surely, 2^20445546 is an apocalyptic number.

20445546 is an abundant number, since it is smaller than the sum of its proper divisors (24163062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20445546 is a wasteful number, since it uses less digits than its factorization.

20445546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309797.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 20445546 is about 4521.6751320722. The cubic root of 20445546 is about 273.4426395399.

Adding to 20445546 its reverse (64554402), we get a palindrome (84999948).

The spelling of 20445546 in words is "twenty million, four hundred forty-five thousand, five hundred forty-six".