20949638 has 8 divisors (see below), whose sum is σ = 31444200. Its totient is φ = 10468240.

The previous prime is 20949631. The next prime is 20949667. The reversal of 20949638 is 83694902.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20949595 and 20949604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949631) 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, 3458 + ... + 7338.

It is an arithmetic number, because the mean of its divisors is an integer number (3930525).

Almost surely, 2^20949638 is an apocalyptic number.

20949638 is a deficient number, since it is larger than the sum of its proper divisors (10494562).

20949638 is a wasteful number, since it uses less digits than its factorization.

20949638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6582.

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

The square root of 20949638 is about 4577.0774518245. The cubic root of 20949638 is about 275.6716935750.

The spelling of 20949638 in words is "twenty million, nine hundred forty-nine thousand, six hundred thirty-eight".