20625647 has 8 divisors (see below), whose sum is σ = 23801856. Its totient is φ = 17506872.

The previous prime is 20625629. The next prime is 20625653. The reversal of 20625647 is 74652602.

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 20625647 - 2¹⁰ = 20624623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625617) 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, 13583 + ... + 15024.

It is an arithmetic number, because the mean of its divisors is an integer number (2975232).

Almost surely, 2^20625647 is an apocalyptic number.

20625647 is a deficient number, since it is larger than the sum of its proper divisors (3176209).

20625647 is a wasteful number, since it uses less digits than its factorization.

20625647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28717.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20625647 is about 4541.5467629432. The cubic root of 20625647 is about 274.2431952036.

The spelling of 20625647 in words is "twenty million, six hundred twenty-five thousand, six hundred forty-seven".