20773522555 has 16 divisors (see below), whose sum is σ = 26650862784. Its totient is φ = 15489377280.

The previous prime is 20773522519. The next prime is 20773522591. The reversal of 20773522555 is 55522537702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20773522519) and next prime (20773522591).

It is not a de Polignac number, because 20773522555 - 2¹¹ = 20773520507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1177626 + ... + 1195135.

It is an arithmetic number, because the mean of its divisors is an integer number (1665678924).

Almost surely, 2^20773522555 is an apocalyptic number.

20773522555 is a deficient number, since it is larger than the sum of its proper divisors (5877340229).

20773522555 is a wasteful number, since it uses less digits than its factorization.

20773522555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372886.

The product of its (nonzero) digits is 735000, while the sum is 43.

The spelling of 20773522555 in words is "twenty billion, seven hundred seventy-three million, five hundred twenty-two thousand, five hundred fifty-five".