20670745 has 16 divisors (see below), whose sum is σ = 25724160. Its totient is φ = 15934464.

The previous prime is 20670739. The next prime is 20670757. The reversal of 20670745 is 54707602.

It is a cyclic number.

It is not a de Polignac number, because 20670745 - 2³ = 20670737 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 16377 + ... + 17593.

It is an arithmetic number, because the mean of its divisors is an integer number (1607760).

Almost surely, 2^20670745 is an apocalyptic number.

It is an amenable number.

20670745 is a deficient number, since it is larger than the sum of its proper divisors (5053415).

20670745 is a wasteful number, since it uses less digits than its factorization.

20670745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 20670745 is about 4546.5091003978. The cubic root of 20670745 is about 274.4429273861.

The spelling of 20670745 in words is "twenty million, six hundred seventy thousand, seven hundred forty-five".