20683287 has 6 divisors (see below), whose sum is σ = 29875872. Its totient is φ = 13788852.

The previous prime is 20683283. The next prime is 20683297. The reversal of 20683287 is 78238602.

It is a happy number.

It is not a de Polignac number, because 20683287 - 2² = 20683283 is a prime.

It is a super-2 number, since 2×20683287² = 855596722248738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20683283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1149063 + ... + 1149080.

It is an arithmetic number, because the mean of its divisors is an integer number (4979312).

Almost surely, 2^20683287 is an apocalyptic number.

20683287 is a deficient number, since it is larger than the sum of its proper divisors (9192585).

20683287 is a wasteful number, since it uses less digits than its factorization.

20683287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298149 (or 2298146 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20683287 is about 4547.8881912378. Note that the first 3 decimals coincide. The cubic root of 20683287 is about 274.4984223585.

The spelling of 20683287 in words is "twenty million, six hundred eighty-three thousand, two hundred eighty-seven".