20784304283257 has 8 divisors (see below), whose sum is σ = 20811234717440. Its totient is φ = 20757378330000.

The previous prime is 20784304283227. The next prime is 20784304283273. The reversal of 20784304283257 is 75238240348702.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20784304283257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20784304283198 and 20784304283207.

It is not an unprimeable number, because it can be changed into a prime (20784304283207) 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, 8212888 + ... + 10441270.

It is an arithmetic number, because the mean of its divisors is an integer number (2601404339680).

Almost surely, 2^{20784304283257} is an apocalyptic number.

It is an amenable number.

20784304283257 is a deficient number, since it is larger than the sum of its proper divisors (26930434183).

20784304283257 is a wasteful number, since it uses less digits than its factorization.

20784304283257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240463.

The product of its (nonzero) digits is 18063360, while the sum is 55.

The spelling of 20784304283257 in words is "twenty trillion, seven hundred eighty-four billion, three hundred four million, two hundred eighty-three thousand, two hundred fifty-seven".