20949946 has 8 divisors (see below), whose sum is σ = 32018004. Its totient is φ = 10277280.

The previous prime is 20949937. The next prime is 20949949. The reversal of 20949946 is 64994902.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 19321 = 4575^2 + 139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20949949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98715 + ... + 98926.

Almost surely, 2^20949946 is an apocalyptic number.

20949946 is a deficient number, since it is larger than the sum of its proper divisors (11068058).

20949946 is a wasteful number, since it uses less digits than its factorization.

20949946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197696.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20949946 is about 4577.1110976248. Note that the first 3 decimals coincide. The cubic root of 20949946 is about 275.6730445366.

The spelling of 20949946 in words is "twenty million, nine hundred forty-nine thousand, nine hundred forty-six".