20631822336 has 560 divisors, whose sum is σ = 68509774080. Its totient is φ = 6157762560.

The previous prime is 20631822329. The next prime is 20631822347. The reversal of 20631822336 is 63322813602.

It is a happy number.

20631822336 is a `hidden beast` number, since 2 + 0 + 6 + 318 + 2 + 2 + 336 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20631822336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 349691875 + ... + 349691933.

Almost surely, 2^20631822336 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 20631822336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34254887040).

20631822336 is an abundant number, since it is smaller than the sum of its proper divisors (47877951744).

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

20631822336 is an equidigital number, since it uses as much as digits as its factorization.

20631822336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 20631822336 in words is "twenty billion, six hundred thirty-one million, eight hundred twenty-two thousand, three hundred thirty-six".