20682387 has 24 divisors (see below), whose sum is σ = 34510320. Its totient is φ = 11796480.

The previous prime is 20682373. The next prime is 20682407. The reversal of 20682387 is 78328602.

It is a happy number.

It is not a de Polignac number, because 20682387 - 2⁸ = 20682131 is a prime.

It is a super-2 number, since 2×20682387² = 855522264035538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20682367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4462 + ... + 7827.

It is an arithmetic number, because the mean of its divisors is an integer number (1437930).

Almost surely, 2^20682387 is an apocalyptic number.

20682387 is a deficient number, since it is larger than the sum of its proper divisors (13827933).

20682387 is a wasteful number, since it uses less digits than its factorization.

20682387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12323 (or 12320 counting only the distinct ones).

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

The square root of 20682387 is about 4547.7892431378. The cubic root of 20682387 is about 274.4944408481.

The spelling of 20682387 in words is "twenty million, six hundred eighty-two thousand, three hundred eighty-seven".