20214665 has 4 divisors (see below), whose sum is σ = 24257604. Its totient is φ = 16171728.

The previous prime is 20214661. The next prime is 20214673. The reversal of 20214665 is 56641202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15147664 + 5067001 = 3892^2 + 2251^2 .

It is a cyclic number.

It is not a de Polignac number, because 20214665 - 2² = 20214661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20214661) 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, 2021462 + ... + 2021471.

It is an arithmetic number, because the mean of its divisors is an integer number (6064401).

Almost surely, 2^20214665 is an apocalyptic number.

It is an amenable number.

20214665 is a deficient number, since it is larger than the sum of its proper divisors (4042939).

20214665 is an equidigital number, since it uses as much as digits as its factorization.

20214665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042938.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20214665 is about 4496.0721746876. The cubic root of 20214665 is about 272.4094584589.

Adding to 20214665 its reverse (56641202), we get a palindrome (76855867).

The spelling of 20214665 in words is "twenty million, two hundred fourteen thousand, six hundred sixty-five".