20625547 has 2 divisors, whose sum is σ = 20625548. Its totient is φ = 20625546.

The previous prime is 20625541. The next prime is 20625569. The reversal of 20625547 is 74552602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20625547 is a prime.

It is not a weakly prime, because it can be changed into another prime (20625541) 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 as a sum of consecutive naturals, namely, 10312773 + 10312774.

It is an arithmetic number, because the mean of its divisors is an integer number (10312774).

Almost surely, 2^20625547 is an apocalyptic number.

20625547 is a deficient number, since it is larger than the sum of its proper divisors (1).

20625547 is an equidigital number, since it uses as much as digits as its factorization.

20625547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20625547 is about 4541.5357534649. The cubic root of 20625547 is about 274.2427519955.

The spelling of 20625547 in words is "twenty million, six hundred twenty-five thousand, five hundred forty-seven".