20890489824 has 36 divisors (see below), whose sum is σ = 59407331256. Its totient is φ = 6963496512.

The previous prime is 20890489811. The next prime is 20890489843. The reversal of 20890489824 is 42898409802.

20890489824 is a `hidden beast` number, since 2 + 0 + 89 + 0 + 489 + 82 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36267924 + ... + 36268499.

It is an arithmetic number, because the mean of its divisors is an integer number (1650203646).

Almost surely, 2^20890489824 is an apocalyptic number.

20890489824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20890489824 is an abundant number, since it is smaller than the sum of its proper divisors (38516841432).

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

20890489824 is a wasteful number, since it uses less digits than its factorization.

20890489824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72536439 (or 72536428 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 20890489824 in words is "twenty billion, eight hundred ninety million, four hundred eighty-nine thousand, eight hundred twenty-four".