20670535 has 4 divisors (see below), whose sum is σ = 24804648. Its totient is φ = 16536424.

The previous prime is 20670523. The next prime is 20670547. The reversal of 20670535 is 53507602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20670523) and next prime (20670547).

It is a cyclic number.

It is not a de Polignac number, because 20670535 - 2¹⁵ = 20637767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2067049 + ... + 2067058.

It is an arithmetic number, because the mean of its divisors is an integer number (6201162).

Almost surely, 2^20670535 is an apocalyptic number.

20670535 is a deficient number, since it is larger than the sum of its proper divisors (4134113).

20670535 is an equidigital number, since it uses as much as digits as its factorization.

20670535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134112.

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

The square root of 20670535 is about 4546.4860056971. The cubic root of 20670535 is about 274.4419980016.

The spelling of 20670535 in words is "twenty million, six hundred seventy thousand, five hundred thirty-five".