19906829 has 4 divisors (see below), whose sum is σ = 19933884. Its totient is φ = 19879776.

The previous prime is 19906819. The next prime is 19906837. The reversal of 19906829 is 92860991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92860991 = 223 ⋅416417.

It can be written as a sum of positive squares in 2 ways, for example, as 10876804 + 9030025 = 3298^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 19906829 - 2¹⁶ = 19841293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19906829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19906819) 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, 12392 + ... + 13905.

It is an arithmetic number, because the mean of its divisors is an integer number (4983471).

Almost surely, 2^19906829 is an apocalyptic number.

It is an amenable number.

19906829 is a deficient number, since it is larger than the sum of its proper divisors (27055).

19906829 is an equidigital number, since it uses as much as digits as its factorization.

19906829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27054.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 19906829 is about 4461.7069603460. The cubic root of 19906829 is about 271.0195970814.

The spelling of 19906829 in words is "nineteen million, nine hundred six thousand, eight hundred twenty-nine".