20783678653 has 16 divisors (see below), whose sum is σ = 21295859200. Its totient is φ = 20278318896.

The previous prime is 20783678647. The next prime is 20783678749. The reversal of 20783678653 is 35687638702.

It is a cyclic number.

It is not a de Polignac number, because 20783678653 - 2⁹ = 20783678141 is a prime.

It is a super-2 number, since 2×20783678653² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20783678594 and 20783678603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20783678603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3349648 + ... + 3355846.

It is an arithmetic number, because the mean of its divisors is an integer number (1330991200).

Almost surely, 2^20783678653 is an apocalyptic number.

It is an amenable number.

20783678653 is a deficient number, since it is larger than the sum of its proper divisors (512180547).

20783678653 is a wasteful number, since it uses less digits than its factorization.

20783678653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 20783678653 in words is "twenty billion, seven hundred eighty-three million, six hundred seventy-eight thousand, six hundred fifty-three".