20108785677 has 16 divisors (see below), whose sum is σ = 26909113920. Its totient is φ = 13357216512.

The previous prime is 20108785661. The next prime is 20108785709. The reversal of 20108785677 is 77658780102.

It is not a de Polignac number, because 20108785677 - 2⁴ = 20108785661 is a prime.

It is a super-2 number, since 2×20108785677² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108785637) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1543563 + ... + 1556535.

It is an arithmetic number, because the mean of its divisors is an integer number (1681819620).

Almost surely, 2^20108785677 is an apocalyptic number.

It is an amenable number.

20108785677 is a deficient number, since it is larger than the sum of its proper divisors (6800328243).

20108785677 is a wasteful number, since it uses less digits than its factorization.

20108785677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14812.

The product of its (nonzero) digits is 1317120, while the sum is 51.

The spelling of 20108785677 in words is "twenty billion, one hundred eight million, seven hundred eighty-five thousand, six hundred seventy-seven".