20725867 has 2 divisors, whose sum is σ = 20725868. Its totient is φ = 20725866.

The previous prime is 20725853. The next prime is 20725889. The reversal of 20725867 is 76852702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20725867 - 2⁷ = 20725739 is a prime.

It is not a weakly prime, because it can be changed into another prime (20725667) 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 as a sum of consecutive naturals, namely, 10362933 + 10362934.

It is an arithmetic number, because the mean of its divisors is an integer number (10362934).

Almost surely, 2^20725867 is an apocalyptic number.

20725867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725867 is an equidigital number, since it uses as much as digits as its factorization.

20725867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 20725867 is about 4552.5670780341. The cubic root of 20725867 is about 274.6866601906.

The spelling of 20725867 in words is "twenty million, seven hundred twenty-five thousand, eight hundred sixty-seven".