20216045 has 16 divisors (see below), whose sum is σ = 25349760. Its totient is φ = 15457344.

The previous prime is 20216033. The next prime is 20216047. The reversal of 20216045 is 54061202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20216045 - 2¹⁰ = 20215021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216047) 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, 14864 + ... + 16166.

It is an arithmetic number, because the mean of its divisors is an integer number (1584360).

Almost surely, 2^20216045 is an apocalyptic number.

It is an amenable number.

20216045 is a deficient number, since it is larger than the sum of its proper divisors (5133715).

20216045 is a wasteful number, since it uses less digits than its factorization.

20216045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20216045 is about 4496.2256393557. The cubic root of 20216045 is about 272.4156572012.

Adding to 20216045 its reverse (54061202), we get a palindrome (74277247).

The spelling of 20216045 in words is "twenty million, two hundred sixteen thousand, forty-five".