20858655377 has 4 divisors (see below), whose sum is σ = 23838463296. Its totient is φ = 17878847460.

The previous prime is 20858655371. The next prime is 20858655437. The reversal of 20858655377 is 77355685802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20858655377 - 2⁶ = 20858655313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20858655371) 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 3 ways as a sum of consecutive naturals, for example, 1489903949 + ... + 1489903962.

It is an arithmetic number, because the mean of its divisors is an integer number (5959615824).

Almost surely, 2^20858655377 is an apocalyptic number.

It is an amenable number.

20858655377 is a deficient number, since it is larger than the sum of its proper divisors (2979807919).

20858655377 is an equidigital number, since it uses as much as digits as its factorization.

20858655377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979807918.

The product of its (nonzero) digits is 14112000, while the sum is 56.

The spelling of 20858655377 in words is "twenty billion, eight hundred fifty-eight million, six hundred fifty-five thousand, three hundred seventy-seven".