20781732396 has 24 divisors (see below), whose sum is σ = 48499706304.
Its totient is φ = 6925958800.
The previous prime is 20781732371. The next prime is 20781732397. The reversal of 20781732396 is 69323718702.
It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.
It is not an unprimeable number, because it can be changed into a prime (20781732397) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92130 + ... + 223721.
It is an arithmetic number, because the mean of its divisors is an integer number (2020821096).
Almost surely, 220781732396 is an apocalyptic number.
It is an amenable number.
20781732396 is an abundant number, since it is smaller than the sum of its proper divisors (27717973908).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20781732396 is a wasteful number, since it uses less digits than its factorization.
20781732396 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 321341 (or 321339 counting only the distinct ones).
The product of its (nonzero) digits is 762048, while the sum is 48.
The spelling of 20781732396 in words is "twenty billion, seven hundred eighty-one million, seven hundred thirty-two thousand, three hundred ninety-six".