20690201 has 6 divisors (see below), whose sum is σ = 24068250. Its totient is φ = 17734416.

The previous prime is 20690177. The next prime is 20690209. The reversal of 20690201 is 10209602.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 4206601 = 4060^2 + 2051^2 .

It is not a de Polignac number, because 20690201 - 2¹⁴ = 20673817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20690209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211076 + ... + 211173.

It is an arithmetic number, because the mean of its divisors is an integer number (4011375).

Almost surely, 2^20690201 is an apocalyptic number.

It is an amenable number.

20690201 is a deficient number, since it is larger than the sum of its proper divisors (3378049).

20690201 is an equidigital number, since it uses as much as digits as its factorization.

20690201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422263 (or 422256 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20690201 is about 4548.6482607474. The cubic root of 20690201 is about 274.5290053546.

Adding to 20690201 its reverse (10209602), we get a palindrome (30899803).

The spelling of 20690201 in words is "twenty million, six hundred ninety thousand, two hundred one".