20456669 has 2 divisors, whose sum is σ = 20456670. Its totient is φ = 20456668.

The previous prime is 20456651. The next prime is 20456699. The reversal of 20456669 is 96665402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 6692569 = 3710^2 + 2587^2 .

It is a cyclic number.

It is not a de Polignac number, because 20456669 - 2¹² = 20452573 is a prime.

It is a super-2 number, since 2×20456669² = 836950613151122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20456699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228334 + 10228335.

It is an arithmetic number, because the mean of its divisors is an integer number (10228335).

Almost surely, 2^20456669 is an apocalyptic number.

It is an amenable number.

20456669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456669 is an equidigital number, since it uses as much as digits as its factorization.

20456669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 20456669 is about 4522.9049293568. The cubic root of 20456669 is about 273.4922175929.

The spelling of 20456669 in words is "twenty million, four hundred fifty-six thousand, six hundred sixty-nine".