20208945 has 8 divisors (see below), whose sum is σ = 32334336. Its totient is φ = 10778096.

The previous prime is 20208907. The next prime is 20208959. The reversal of 20208945 is 54980202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20208945 - 2⁷ = 20208817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673617 + ... + 673646.

It is an arithmetic number, because the mean of its divisors is an integer number (4041792).

Almost surely, 2^20208945 is an apocalyptic number.

It is an amenable number.

20208945 is a deficient number, since it is larger than the sum of its proper divisors (12125391).

20208945 is a wasteful number, since it uses less digits than its factorization.

20208945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347271.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20208945 is about 4495.4360188974. The cubic root of 20208945 is about 272.3837621126.

The spelling of 20208945 in words is "twenty million, two hundred eight thousand, nine hundred forty-five".