20676745 has 4 divisors (see below), whose sum is σ = 24812100. Its totient is φ = 16541392.

The previous prime is 20676707. The next prime is 20676781. The reversal of 20676745 is 54767602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12313081 + 8363664 = 3509^2 + 2892^2 .

It is a cyclic number.

It is not a de Polignac number, because 20676745 - 2¹³ = 20668553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067670 + ... + 2067679.

It is an arithmetic number, because the mean of its divisors is an integer number (6203025).

Almost surely, 2^20676745 is an apocalyptic number.

It is an amenable number.

20676745 is a deficient number, since it is larger than the sum of its proper divisors (4135355).

20676745 is an equidigital number, since it uses as much as digits as its factorization.

20676745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4135354.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 20676745 is about 4547.1688994362. The cubic root of 20676745 is about 274.4694785701.

The spelling of 20676745 in words is "twenty million, six hundred seventy-six thousand, seven hundred forty-five".