20996129 has 16 divisors (see below), whose sum is σ = 26303616. Its totient is φ = 16281600.

The previous prime is 20996123. The next prime is 20996149. The reversal of 20996129 is 92169902.

It is a cyclic number.

It is not a de Polignac number, because 20996129 - 2⁸ = 20995873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20996092 and 20996101.

It is not an unprimeable number, because it can be changed into a prime (20996123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19259 + ... + 20319.

It is an arithmetic number, because the mean of its divisors is an integer number (1643976).

Almost surely, 2^20996129 is an apocalyptic number.

It is an amenable number.

20996129 is a deficient number, since it is larger than the sum of its proper divisors (5307487).

20996129 is a wasteful number, since it uses less digits than its factorization.

20996129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 20996129 is about 4582.1533147637. The cubic root of 20996129 is about 275.8754645401.

It can be divided in two parts, 2099 and 6129, that added together give a palindrome (8228).

The spelling of 20996129 in words is "twenty million, nine hundred ninety-six thousand, one hundred twenty-nine".