20377859209 has 2 divisors, whose sum is σ = 20377859210. Its totient is φ = 20377859208.

The previous prime is 20377859141. The next prime is 20377859213. The reversal of 20377859209 is 90295877302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14225809984 + 6152049225 = 119272^2 + 78435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20377859209 - 2¹⁹ = 20377334921 is a prime.

It is a super-2 number, since 2×20377859209² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20377859219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188929604 + 10188929605.

It is an arithmetic number, because the mean of its divisors is an integer number (10188929605).

Almost surely, 2^20377859209 is an apocalyptic number.

It is an amenable number.

20377859209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377859209 is an equidigital number, since it uses as much as digits as its factorization.

20377859209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 20377859209 in words is "twenty billion, three hundred seventy-seven million, eight hundred fifty-nine thousand, two hundred nine".