20214491 has 4 divisors (see below), whose sum is σ = 22052184. Its totient is φ = 18376800.

The previous prime is 20214451. The next prime is 20214497. The reversal of 20214491 is 19441202.

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

It is a cyclic number.

It is not a de Polignac number, because 20214491 - 2⁶ = 20214427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20214497) 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, 918830 + ... + 918851.

It is an arithmetic number, because the mean of its divisors is an integer number (5513046).

Almost surely, 2^20214491 is an apocalyptic number.

20214491 is a deficient number, since it is larger than the sum of its proper divisors (1837693).

20214491 is a wasteful number, since it uses less digits than its factorization.

20214491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837692.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20214491 is about 4496.0528244228. The cubic root of 20214491 is about 272.4086768583.

Adding to 20214491 its reverse (19441202), we get a palindrome (39655693).

The spelling of 20214491 in words is "twenty million, two hundred fourteen thousand, four hundred ninety-one".