20786369 has 2 divisors, whose sum is σ = 20786370. Its totient is φ = 20786368.

The previous prime is 20786351. The next prime is 20786377. The reversal of 20786369 is 96368702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 4464769 = 4040^2 + 2113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20786369 is a prime.

It is a super-2 number, since 2×20786369² = 864146272408322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20786669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10393184 + 10393185.

It is an arithmetic number, because the mean of its divisors is an integer number (10393185).

Almost surely, 2^20786369 is an apocalyptic number.

It is an amenable number.

20786369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20786369 is an equidigital number, since it uses as much as digits as its factorization.

20786369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20786369 is about 4559.2070582504. The cubic root of 20786369 is about 274.9536847621.

The spelling of 20786369 in words is "twenty million, seven hundred eighty-six thousand, three hundred sixty-nine".