20164621 has 2 divisors, whose sum is σ = 20164622. Its totient is φ = 20164620.

The previous prime is 20164597. The next prime is 20164631. The reversal of 20164621 is 12646102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14356521 + 5808100 = 3789^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20164621 - 2⁵ = 20164589 is a prime.

It is a super-2 number, since 2×20164621² = 813223880147282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20164592 and 20164601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20164631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082310 + 10082311.

It is an arithmetic number, because the mean of its divisors is an integer number (10082311).

Almost surely, 2^20164621 is an apocalyptic number.

It is an amenable number.

20164621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164621 is an equidigital number, since it uses as much as digits as its factorization.

20164621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20164621 is about 4490.5034238936. The cubic root of 20164621 is about 272.1844778310.

The spelling of 20164621 in words is "twenty million, one hundred sixty-four thousand, six hundred twenty-one".