20006545 has 16 divisors (see below), whose sum is σ = 25985232. Its totient is φ = 14699520.

The previous prime is 20006543. The next prime is 20006551. The reversal of 20006545 is 54560002.

It can be written as a sum of positive squares in 8 ways, for example, as 576081 + 19430464 = 759^2 + 4408^2 .

It is not a de Polignac number, because 20006545 - 2¹ = 20006543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20006543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14485 + ... + 15805.

It is an arithmetic number, because the mean of its divisors is an integer number (1624077).

Almost surely, 2^20006545 is an apocalyptic number.

It is an amenable number.

20006545 is a deficient number, since it is larger than the sum of its proper divisors (5978687).

20006545 is a wasteful number, since it uses less digits than its factorization.

20006545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20006545 is about 4472.8676483884. The cubic root of 20006545 is about 271.4713682023.

Adding to 20006545 its reverse (54560002), we get a palindrome (74566547).

The spelling of 20006545 in words is "twenty million, six thousand, five hundred forty-five".