20890103879 has 4 divisors (see below), whose sum is σ = 20890411080. Its totient is φ = 20889796680.

The previous prime is 20890103833. The next prime is 20890103881. The reversal of 20890103879 is 97830109802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97830109802 = 2 ⋅48915054901.

It is a cyclic number.

It is not a de Polignac number, because 20890103879 - 2⁸ = 20890103623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20890103279) 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 in 3 ways as a sum of consecutive naturals, for example, 1184 + ... + 204405.

It is an arithmetic number, because the mean of its divisors is an integer number (5222602770).

Almost surely, 2^20890103879 is an apocalyptic number.

20890103879 is a deficient number, since it is larger than the sum of its proper divisors (307201).

20890103879 is a wasteful number, since it uses less digits than its factorization.

20890103879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307200.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 20890103879 in words is "twenty billion, eight hundred ninety million, one hundred three thousand, eight hundred seventy-nine".