20787757477463 has 4 divisors (see below), whose sum is σ = 20787771185520. Its totient is φ = 20787743769408.

The previous prime is 20787757477457. The next prime is 20787757477499. The reversal of 20787757477463 is 36477475778702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20787757477463 - 2¹² = 20787757473367 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 (20787757477433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4249403 + ... + 7722236.

It is an arithmetic number, because the mean of its divisors is an integer number (5196942796380).

Almost surely, 2^{20787757477463} is an apocalyptic number.

20787757477463 is a deficient number, since it is larger than the sum of its proper divisors (13708057).

20787757477463 is a wasteful number, since it uses less digits than its factorization.

20787757477463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13708056.

The product of its (nonzero) digits is 2710632960, while the sum is 74.

The spelling of 20787757477463 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-seven thousand, four hundred sixty-three".