20800781332 has 6 divisors (see below), whose sum is σ = 36401367338. Its totient is φ = 10400390664.

The previous prime is 20800781327. The next prime is 20800781363. The reversal of 20800781332 is 23318700802.

It can be written as a sum of positive squares in only one way, i.e., 12985514116 + 7815267216 = 113954^2 + 88404^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2600097663 + ... + 2600097670.

Almost surely, 2^20800781332 is an apocalyptic number.

It is an amenable number.

20800781332 is a deficient number, since it is larger than the sum of its proper divisors (15600586006).

20800781332 is a wasteful number, since it uses less digits than its factorization.

20800781332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200195337 (or 5200195335 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 20800781332 in words is "twenty billion, eight hundred million, seven hundred eighty-one thousand, three hundred thirty-two".