20778857503055 has 16 divisors (see below), whose sum is σ = 25839123565824. Its totient is φ = 16024262615040.

The previous prime is 20778857503049. The next prime is 20778857503057. The reversal of 20778857503055 is 55030575887702.

It is not a de Polignac number, because 20778857503055 - 2¹⁰ = 20778857502031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778857503057) 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, 260771732 + ... + 260851401.

It is an arithmetic number, because the mean of its divisors is an integer number (1614945222864).

Almost surely, 2^{20778857503055} is an apocalyptic number.

20778857503055 is a deficient number, since it is larger than the sum of its proper divisors (5060266062769).

20778857503055 is a wasteful number, since it uses less digits than its factorization.

20778857503055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521623426.

The product of its (nonzero) digits is 82320000, while the sum is 62.

The spelling of 20778857503055 in words is "twenty trillion, seven hundred seventy-eight billion, eight hundred fifty-seven million, five hundred three thousand, fifty-five".