20788920396 has 72 divisors (see below), whose sum is σ = 54413551920. Its totient is φ = 6684322176.

The previous prime is 20788920391. The next prime is 20788920413. The reversal of 20788920396 is 69302988702.

It is a happy number.

It is a super-2 number, since 2×20788920396² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20788920391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1157235 + ... + 1175061.

Almost surely, 2^20788920396 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 20788920396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27206775960).

20788920396 is an abundant number, since it is smaller than the sum of its proper divisors (33624631524).

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

20788920396 is a wasteful number, since it uses less digits than its factorization.

20788920396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18983 (or 18978 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 20788920396 in words is "twenty billion, seven hundred eighty-eight million, nine hundred twenty thousand, three hundred ninety-six".