20696129 has 4 divisors (see below), whose sum is σ = 21086676. Its totient is φ = 20305584.

The previous prime is 20696119. The next prime is 20696147. The reversal of 20696129 is 92169602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8862529 + 11833600 = 2977^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20696129 - 2²⁴ = 3918913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20696119) 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, 195194 + ... + 195299.

It is an arithmetic number, because the mean of its divisors is an integer number (5271669).

Almost surely, 2^20696129 is an apocalyptic number.

It is an amenable number.

20696129 is a deficient number, since it is larger than the sum of its proper divisors (390547).

20696129 is an equidigital number, since it uses as much as digits as its factorization.

20696129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390546.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20696129 is about 4549.2998362385. The cubic root of 20696129 is about 274.5552215095. Note that the first 3 decimals are identical.

The spelling of 20696129 in words is "twenty million, six hundred ninety-six thousand, one hundred twenty-nine".