20214661 has 2 divisors, whose sum is σ = 20214662. Its totient is φ = 20214660.

The previous prime is 20214647. The next prime is 20214673. The reversal of 20214661 is 16641202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 2825761 = 4170^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 20214661 - 2⁹ = 20214149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20214611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107330 + 10107331.

It is an arithmetic number, because the mean of its divisors is an integer number (10107331).

Almost surely, 2^20214661 is an apocalyptic number.

It is an amenable number.

20214661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20214661 is an equidigital number, since it uses as much as digits as its factorization.

20214661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20214661 is about 4496.0717298549. The cubic root of 20214661 is about 272.4094404911.

Adding to 20214661 its reverse (16641202), we get a palindrome (36855863).

The spelling of 20214661 in words is "twenty million, two hundred fourteen thousand, six hundred sixty-one".