20910890286 has 128 divisors (see below), whose sum is σ = 54684564480. Its totient is φ = 5839344000.

The previous prime is 20910890281. The next prime is 20910890293. The reversal of 20910890286 is 68209801902.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20910890281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5411191 + ... + 5415053.

It is an arithmetic number, because the mean of its divisors is an integer number (427223160).

Almost surely, 2^20910890286 is an apocalyptic number.

20910890286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20910890286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27342282240).

20910890286 is an abundant number, since it is smaller than the sum of its proper divisors (33773674194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20910890286 is a wasteful number, since it uses less digits than its factorization.

20910890286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4599 (or 4593 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 20910890286 in words is "twenty billion, nine hundred ten million, eight hundred ninety thousand, two hundred eighty-six".