20967838 has 4 divisors (see below), whose sum is σ = 31451760. Its totient is φ = 10483918.

The previous prime is 20967823. The next prime is 20967839. The reversal of 20967838 is 83876902.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20967794 and 20967803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20967839) 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 as a sum of consecutive naturals, namely, 5241958 + ... + 5241961.

It is an arithmetic number, because the mean of its divisors is an integer number (7862940).

Almost surely, 2^20967838 is an apocalyptic number.

20967838 is a deficient number, since it is larger than the sum of its proper divisors (10483922).

20967838 is a wasteful number, since it uses less digits than its factorization.

20967838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10483921.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20967838 is about 4579.0651884419. The cubic root of 20967838 is about 275.7515004054.

The spelling of 20967838 in words is "twenty million, nine hundred sixty-seven thousand, eight hundred thirty-eight".