20770671555 has 24 divisors (see below), whose sum is σ = 36023551200. Its totient is φ = 11071213440.

The previous prime is 20770671533. The next prime is 20770671619. The reversal of 20770671555 is 55517607702.

It is a happy number.

20770671555 is a `hidden beast` number, since 20 + 7 + 7 + 0 + 6 + 71 + 555 = 666.

It is not a de Polignac number, because 20770671555 - 2¹³ = 20770663363 is a prime.

It is a super-2 number, since 2×20770671555² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20770671555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56655 + ... + 211544.

It is an arithmetic number, because the mean of its divisors is an integer number (1500981300).

Almost surely, 2^20770671555 is an apocalyptic number.

20770671555 is a deficient number, since it is larger than the sum of its proper divisors (15252879645).

20770671555 is a wasteful number, since it uses less digits than its factorization.

20770671555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269931 (or 269928 counting only the distinct ones).

The product of its (nonzero) digits is 514500, while the sum is 45.

The spelling of 20770671555 in words is "twenty billion, seven hundred seventy million, six hundred seventy-one thousand, five hundred fifty-five".