20219669 has 2 divisors, whose sum is σ = 20219670. Its totient is φ = 20219668.

The previous prime is 20219653. The next prime is 20219671. The reversal of 20219669 is 96691202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10640644 + 9579025 = 3262^2 + 3095^2 .

It is a cyclic number.

It is not a de Polignac number, because 20219669 - 2⁴ = 20219653 is a prime.

It is a super-2 number, since 2×20219669² = 817670028939122, which contains 22 as substring.

Together with 20219671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20219569) 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, 10109834 + 10109835.

It is an arithmetic number, because the mean of its divisors is an integer number (10109835).

Almost surely, 2^20219669 is an apocalyptic number.

It is an amenable number.

20219669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219669 is an equidigital number, since it uses as much as digits as its factorization.

20219669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20219669 is about 4496.6286259819. The cubic root of 20219669 is about 272.4319342946.

The spelling of 20219669 in words is "twenty million, two hundred nineteen thousand, six hundred sixty-nine".