20983651 has 8 divisors (see below), whose sum is σ = 22649760. Its totient is φ = 19324992.

The previous prime is 20983649. The next prime is 20983681. The reversal of 20983651 is 15638902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20983651 - 2¹ = 20983649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20983681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4935 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (2831220).

Almost surely, 2^20983651 is an apocalyptic number.

20983651 is a deficient number, since it is larger than the sum of its proper divisors (1666109).

20983651 is a wasteful number, since it uses less digits than its factorization.

20983651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20983651 is about 4580.7915254899. The cubic root of 20983651 is about 275.8208027783.

The spelling of 20983651 in words is "twenty million, nine hundred eighty-three thousand, six hundred fifty-one".