20102001977 has 2 divisors, whose sum is σ = 20102001978. Its totient is φ = 20102001976.

The previous prime is 20102001967. The next prime is 20102001989. The reversal of 20102001977 is 77910020102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14898399481 + 5203602496 = 122059^2 + 72136^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102001977 - 2⁴ = 20102001961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20102001967) 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 as a sum of consecutive naturals, namely, 10051000988 + 10051000989.

It is an arithmetic number, because the mean of its divisors is an integer number (10051000989).

Almost surely, 2^20102001977 is an apocalyptic number.

It is an amenable number.

20102001977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102001977 is an equidigital number, since it uses as much as digits as its factorization.

20102001977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 29.

The spelling of 20102001977 in words is "twenty billion, one hundred two million, one thousand, nine hundred seventy-seven".