20780653 has 8 divisors (see below), whose sum is σ = 21584288. Its totient is φ = 19991664.

The previous prime is 20780581. The next prime is 20780657. The reversal of 20780653 is 35608702.

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

It is a cyclic number.

It is not a de Polignac number, because 20780653 - 2⁹ = 20780141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780657) 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, 726 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (2698036).

Almost surely, 2^20780653 is an apocalyptic number.

It is an amenable number.

20780653 is a deficient number, since it is larger than the sum of its proper divisors (803635).

20780653 is an equidigital number, since it uses as much as digits as its factorization.

20780653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7323.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20780653 is about 4558.5801517578. The cubic root of 20780653 is about 274.9284794726.

The spelling of 20780653 in words is "twenty million, seven hundred eighty thousand, six hundred fifty-three".