20103999977 has 4 divisors (see below), whose sum is σ = 20143497540. Its totient is φ = 20064502416.

The previous prime is 20103999973. The next prime is 20103999989. The reversal of 20103999977 is 77999930102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16221588496 + 3882411481 = 127364^2 + 62309^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103999977 - 2² = 20103999973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103999973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19748018 + ... + 19749035.

It is an arithmetic number, because the mean of its divisors is an integer number (5035874385).

Almost surely, 2^20103999977 is an apocalyptic number.

It is an amenable number.

20103999977 is a deficient number, since it is larger than the sum of its proper divisors (39497563).

20103999977 is an equidigital number, since it uses as much as digits as its factorization.

20103999977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39497562.

The product of its (nonzero) digits is 1928934, while the sum is 56.

The spelling of 20103999977 in words is "twenty billion, one hundred three million, nine hundred ninety-nine thousand, nine hundred seventy-seven".