20377859009 has 2 divisors, whose sum is σ = 20377859010. Its totient is φ = 20377859008.

The previous prime is 20377858993. The next prime is 20377859017. The reversal of 20377859009 is 90095877302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10630641025 + 9747217984 = 103105^2 + 98728^2 .

It is a cyclic number.

It is not a de Polignac number, because 20377859009 - 2⁴ = 20377858993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20377859209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188929504 + 10188929505.

It is an arithmetic number, because the mean of its divisors is an integer number (10188929505).

Almost surely, 2^20377859009 is an apocalyptic number.

It is an amenable number.

20377859009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377859009 is an equidigital number, since it uses as much as digits as its factorization.

20377859009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 50.

The spelling of 20377859009 in words is "twenty billion, three hundred seventy-seven million, eight hundred fifty-nine thousand, nine".