20808489510 has 96 divisors (see below), whose sum is σ = 54727964928. Its totient is φ = 5484939840.

The previous prime is 20808489469. The next prime is 20808489539. The reversal of 20808489510 is 1598480802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5958865 + ... + 5962355.

It is an arithmetic number, because the mean of its divisors is an integer number (570082968).

Almost surely, 2^20808489510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20808489510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27363982464).

20808489510 is an abundant number, since it is smaller than the sum of its proper divisors (33919475418).

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

20808489510 is a wasteful number, since it uses less digits than its factorization.

20808489510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250 (or 4247 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 20808489510 in words is "twenty billion, eight hundred eight million, four hundred eighty-nine thousand, five hundred ten".