20461647 has 8 divisors (see below), whose sum is σ = 27308160. Its totient is φ = 13628120.

The previous prime is 20461633. The next prime is 20461673. The reversal of 20461647 is 74616402.

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 20461647 - 2⁴ = 20461631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20461607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1372 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (3413520).

Almost surely, 2^20461647 is an apocalyptic number.

20461647 is a deficient number, since it is larger than the sum of its proper divisors (6846513).

20461647 is a wasteful number, since it uses less digits than its factorization.

20461647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20461647 is about 4523.4552059239. The cubic root of 20461647 is about 273.5143999896.

The spelling of 20461647 in words is "twenty million, four hundred sixty-one thousand, six hundred forty-seven".