20810357696 has 112 divisors (see below), whose sum is σ = 47007475200. Its totient is φ = 9079861248.

The previous prime is 20810357681. The next prime is 20810357699. The reversal of 20810357696 is 69675301802.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 20810357696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20810357699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 960875 + ... + 982293.

It is an arithmetic number, because the mean of its divisors is an integer number (419709600).

Almost surely, 2^20810357696 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 20810357696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23503737600).

20810357696 is an abundant number, since it is smaller than the sum of its proper divisors (26197117504).

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

20810357696 is a wasteful number, since it uses less digits than its factorization.

20810357696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21514 (or 21504 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 20810357696 in words is "twenty billion, eight hundred ten million, three hundred fifty-seven thousand, six hundred ninety-six".