20690275 has 24 divisors (see below), whose sum is σ = 27520560. Its totient is φ = 15375360.

The previous prime is 20690261. The next prime is 20690279. The reversal of 20690275 is 57209602.

It is not a de Polignac number, because 20690275 - 2⁷ = 20690147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20690279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37552 + ... + 38098.

It is an arithmetic number, because the mean of its divisors is an integer number (1146690).

Almost surely, 2^20690275 is an apocalyptic number.

20690275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20690275 is a deficient number, since it is larger than the sum of its proper divisors (6830285).

20690275 is a wasteful number, since it uses less digits than its factorization.

20690275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20690275 is about 4548.6563950248. The cubic root of 20690275 is about 274.5293326451.

Adding to 20690275 its reverse (57209602), we get a palindrome (77899877).

The spelling of 20690275 in words is "twenty million, six hundred ninety thousand, two hundred seventy-five".