20678542777 has 8 divisors (see below), whose sum is σ = 21468983040. Its totient is φ = 19895814480.

The previous prime is 20678542681. The next prime is 20678542793. The reversal of 20678542777 is 77724587602.

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 20678542777 - 2¹⁹ = 20678018489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20678572777) 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, 1922527 + ... + 1933252.

It is an arithmetic number, because the mean of its divisors is an integer number (2683622880).

Almost surely, 2^20678542777 is an apocalyptic number.

It is an amenable number.

20678542777 is a deficient number, since it is larger than the sum of its proper divisors (790440263).

20678542777 is a wasteful number, since it uses less digits than its factorization.

20678542777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855983.

The product of its (nonzero) digits is 9219840, while the sum is 55.

The spelling of 20678542777 in words is "twenty billion, six hundred seventy-eight million, five hundred forty-two thousand, seven hundred seventy-seven".