20860990903 has 4 divisors (see below), whose sum is σ = 21214567080. Its totient is φ = 20507414728.

The previous prime is 20860990897. The next prime is 20860990919. The reversal of 20860990903 is 30909906802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30909906802 = 2 ⋅15454953401.

It is a cyclic number.

It is not a de Polignac number, because 20860990903 - 2¹³ = 20860982711 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 (20860990933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176788000 + ... + 176788117.

It is an arithmetic number, because the mean of its divisors is an integer number (5303641770).

Almost surely, 2^20860990903 is an apocalyptic number.

20860990903 is a deficient number, since it is larger than the sum of its proper divisors (353576177).

20860990903 is an equidigital number, since it uses as much as digits as its factorization.

20860990903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353576176.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 20860990903 in words is "twenty billion, eight hundred sixty million, nine hundred ninety thousand, nine hundred three".