20690170 has 8 divisors (see below), whose sum is σ = 37242324. Its totient is φ = 8276064.

The previous prime is 20690161. The next prime is 20690177. The reversal of 20690170 is 7109602.

It can be written as a sum of positive squares in 2 ways, for example, as 19018321 + 1671849 = 4361^2 + 1293^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20690177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034499 + ... + 1034518.

Almost surely, 2^20690170 is an apocalyptic number.

20690170 is a deficient number, since it is larger than the sum of its proper divisors (16552154).

20690170 is a wasteful number, since it uses less digits than its factorization.

20690170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069024.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 20690170 is about 4548.6448531403. The cubic root of 20690170 is about 274.5288682461.

Adding to 20690170 its reverse (7109602), we get a palindrome (27799772).

The spelling of 20690170 in words is "twenty million, six hundred ninety thousand, one hundred seventy".