20675305 has 12 divisors (see below), whose sum is σ = 28861380. Its totient is φ = 14177184.

The previous prime is 20675273. The next prime is 20675309. The reversal of 20675305 is 50357602.

It can be written as a sum of positive squares in 2 ways, for example, as 15531481 + 5143824 = 3941^2 + 2268^2 .

It is not a de Polignac number, because 20675305 - 2⁵ = 20675273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20675309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41950 + ... + 42439.

It is an arithmetic number, because the mean of its divisors is an integer number (2405115).

Almost surely, 2^20675305 is an apocalyptic number.

It is an amenable number.

20675305 is a deficient number, since it is larger than the sum of its proper divisors (8186075).

20675305 is an equidigital number, since it uses as much as digits as its factorization.

20675305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84408 (or 84401 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 20675305 is about 4547.0105563986. The cubic root of 20675305 is about 274.4631067545.

The spelling of 20675305 in words is "twenty million, six hundred seventy-five thousand, three hundred five".