20818214 has 4 divisors (see below), whose sum is σ = 31227324. Its totient is φ = 10409106.

The previous prime is 20818211. The next prime is 20818223. The reversal of 20818214 is 41281802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41281802 = 2 ⋅20640901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818211) 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 as a sum of consecutive naturals, namely, 5204552 + ... + 5204555.

It is an arithmetic number, because the mean of its divisors is an integer number (7806831).

Almost surely, 2^20818214 is an apocalyptic number.

20818214 is a deficient number, since it is larger than the sum of its proper divisors (10409110).

20818214 is a wasteful number, since it uses less digits than its factorization.

20818214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10409109.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 20818214 is about 4562.6981052881. The cubic root of 20818214 is about 275.0940240473.

The spelling of 20818214 in words is "twenty million, eight hundred eighteen thousand, two hundred fourteen".