20780353 has 8 divisors (see below), whose sum is σ = 22890816. Its totient is φ = 18706800.

The previous prime is 20780329. The next prime is 20780369. The reversal of 20780353 is 35308702.

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 20780353 - 2²¹ = 18683201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20780303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8038 + ... + 10303.

It is an arithmetic number, because the mean of its divisors is an integer number (2861352).

Almost surely, 2^20780353 is an apocalyptic number.

It is an amenable number.

20780353 is a deficient number, since it is larger than the sum of its proper divisors (2110463).

20780353 is a wasteful number, since it uses less digits than its factorization.

20780353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18455.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20780353 is about 4558.5472466565. The cubic root of 20780353 is about 274.9271564641.

The spelling of 20780353 in words is "twenty million, seven hundred eighty thousand, three hundred fifty-three".