20815893516 has 192 divisors, whose sum is σ = 56276398080. Its totient is φ = 5930496000.

The previous prime is 20815893493. The next prime is 20815893533. The reversal of 20815893516 is 61539851802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22215000 + ... + 22215936.

It is an arithmetic number, because the mean of its divisors is an integer number (293106240).

Almost surely, 2^20815893516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20815893516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28138199040).

20815893516 is an abundant number, since it is smaller than the sum of its proper divisors (35460504564).

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

20815893516 is a wasteful number, since it uses less digits than its factorization.

20815893516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 20815893516 in words is "twenty billion, eight hundred fifteen million, eight hundred ninety-three thousand, five hundred sixteen".