20889829 has 4 divisors (see below), whose sum is σ = 20898976. Its totient is φ = 20880684.

The previous prime is 20889811. The next prime is 20889839. The reversal of 20889829 is 92898802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92898802 = 2 ⋅46449401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20889829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20889809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062 + ... + 6784.

It is an arithmetic number, because the mean of its divisors is an integer number (5224744).

Almost surely, 2^20889829 is an apocalyptic number.

It is an amenable number.

20889829 is a deficient number, since it is larger than the sum of its proper divisors (9147).

20889829 is an equidigital number, since it uses as much as digits as its factorization.

20889829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9146.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 20889829 is about 4570.5392460846. The cubic root of 20889829 is about 275.4091056898.

The spelling of 20889829 in words is "twenty million, eight hundred eighty-nine thousand, eight hundred twenty-nine".