20625447 has 16 divisors (see below), whose sum is σ = 28541952. Its totient is φ = 13234560.

The previous prime is 20625439. The next prime is 20625491. The reversal of 20625447 is 74452602.

It is not a de Polignac number, because 20625447 - 2³ = 20625439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20623 + ... + 21599.

It is an arithmetic number, because the mean of its divisors is an integer number (1783872).

Almost surely, 2^20625447 is an apocalyptic number.

20625447 is a deficient number, since it is larger than the sum of its proper divisors (7916505).

20625447 is a wasteful number, since it uses less digits than its factorization.

20625447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 20625447 is about 4541.5247439599. The cubic root of 20625447 is about 274.2423087859.

The spelling of 20625447 in words is "twenty million, six hundred twenty-five thousand, four hundred forty-seven".