20836949 has 4 divisors (see below), whose sum is σ = 23813664. Its totient is φ = 17860236.

The previous prime is 20836931. The next prime is 20836967. The reversal of 20836949 is 94963802.

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.

It is an interprime number because it is at equal distance from previous prime (20836931) and next prime (20836967).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20836949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836909) 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, 1488347 + ... + 1488360.

It is an arithmetic number, because the mean of its divisors is an integer number (5953416).

Almost surely, 2^20836949 is an apocalyptic number.

It is an amenable number.

20836949 is a deficient number, since it is larger than the sum of its proper divisors (2976715).

20836949 is an equidigital number, since it uses as much as digits as its factorization.

20836949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976714.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20836949 is about 4564.7507051317. The cubic root of 20836949 is about 275.1765213781.

The spelling of 20836949 in words is "twenty million, eight hundred thirty-six thousand, nine hundred forty-nine".