20391214 has 4 divisors (see below), whose sum is σ = 30586824. Its totient is φ = 10195606.

The previous prime is 20391197. The next prime is 20391221. The reversal of 20391214 is 41219302.

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

It is a congruent number.

It is an unprimeable number.

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, 5097802 + ... + 5097805.

It is an arithmetic number, because the mean of its divisors is an integer number (7646706).

Almost surely, 2^20391214 is an apocalyptic number.

20391214 is a deficient number, since it is larger than the sum of its proper divisors (10195610).

20391214 is a wasteful number, since it uses less digits than its factorization.

20391214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10195609.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20391214 is about 4515.6631849597. The cubic root of 20391214 is about 273.2002091509.

The spelling of 20391214 in words is "twenty million, three hundred ninety-one thousand, two hundred fourteen".