20864727 has 24 divisors (see below), whose sum is σ = 32698848. Its totient is φ = 12744000.

The previous prime is 20864719. The next prime is 20864731. The reversal of 20864727 is 72746802.

20864727 is a `hidden beast` number, since 2 + 0 + 8 + 647 + 2 + 7 = 666.

It is not a de Polignac number, because 20864727 - 2³ = 20864719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20864691 and 20864700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17077 + ... + 18257.

It is an arithmetic number, because the mean of its divisors is an integer number (1362452).

Almost surely, 2^20864727 is an apocalyptic number.

20864727 is a deficient number, since it is larger than the sum of its proper divisors (11834121).

20864727 is a wasteful number, since it uses less digits than its factorization.

20864727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20864727 is about 4567.7923551755. The cubic root of 20864727 is about 275.2987475131.

The spelling of 20864727 in words is "twenty million, eight hundred sixty-four thousand, seven hundred twenty-seven".