20868769 has 2 divisors, whose sum is σ = 20868770. Its totient is φ = 20868768.

The previous prime is 20868761. The next prime is 20868823. The reversal of 20868769 is 96786802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 5760000 = 3887^2 + 2400^2 .

It is a cyclic number.

It is not a de Polignac number, because 20868769 - 2³ = 20868761 is a prime.

It is a super-2 number, since 2×20868769² = 871011039150722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20868761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434384 + 10434385.

It is an arithmetic number, because the mean of its divisors is an integer number (10434385).

Almost surely, 2^20868769 is an apocalyptic number.

It is an amenable number.

20868769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20868769 is an equidigital number, since it uses as much as digits as its factorization.

20868769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 20868769 is about 4568.2347794307. The cubic root of 20868769 is about 275.3165236972.

The spelling of 20868769 in words is "twenty million, eight hundred sixty-eight thousand, seven hundred sixty-nine".