20900165019 has 4 divisors (see below), whose sum is σ = 27866886696. Its totient is φ = 13933443344.

The previous prime is 20900165009. The next prime is 20900165047. The reversal of 20900165019 is 91056100902.

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

It is a cyclic number.

It is not a de Polignac number, because 20900165019 - 2⁴ = 20900165003 is a prime.

It is a super-2 number, since 2×20900165019² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20900165009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3483360834 + ... + 3483360839.

It is an arithmetic number, because the mean of its divisors is an integer number (6966721674).

Almost surely, 2^20900165019 is an apocalyptic number.

20900165019 is a deficient number, since it is larger than the sum of its proper divisors (6966721677).

20900165019 is an equidigital number, since it uses as much as digits as its factorization.

20900165019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6966721676.

The product of its (nonzero) digits is 4860, while the sum is 33.

The spelling of 20900165019 in words is "twenty billion, nine hundred million, one hundred sixty-five thousand, nineteen".