20779145 has 8 divisors (see below), whose sum is σ = 25739520. Its totient is φ = 16086960.

The previous prime is 20779139. The next prime is 20779147. The reversal of 20779145 is 54197702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20779145 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20779147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66875 + ... + 67184.

It is an arithmetic number, because the mean of its divisors is an integer number (3217440).

Almost surely, 2^20779145 is an apocalyptic number.

It is an amenable number.

20779145 is a deficient number, since it is larger than the sum of its proper divisors (4960375).

20779145 is a wasteful number, since it uses less digits than its factorization.

20779145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134095.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20779145 is about 4558.4147463784. The cubic root of 20779145 is about 274.9218290210.

The spelling of 20779145 in words is "twenty million, seven hundred seventy-nine thousand, one hundred forty-five".