20003869 has 2 divisors, whose sum is σ = 20003870. Its totient is φ = 20003868.

The previous prime is 20003861. The next prime is 20003887. The reversal of 20003869 is 96830002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19695844 + 308025 = 4438^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003869 - 2³ = 20003861 is a prime.

It is a super-2 number, since 2×20003869² = 800309549938322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001934 + 10001935.

It is an arithmetic number, because the mean of its divisors is an integer number (10001935).

Almost surely, 2^20003869 is an apocalyptic number.

It is an amenable number.

20003869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003869 is an equidigital number, since it uses as much as digits as its factorization.

20003869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20003869 is about 4472.5685014318. The cubic root of 20003869 is about 271.4592640005.

The spelling of 20003869 in words is "twenty million, three thousand, eight hundred sixty-nine".