20781732398 has 32 divisors (see below), whose sum is σ = 36925148160. Its totient is φ = 8582807520.

The previous prime is 20781732397. The next prime is 20781732403. The reversal of 20781732398 is 89323718702.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 163403 + ... + 261273.

It is an arithmetic number, because the mean of its divisors is an integer number (1153910880).

Almost surely, 2^20781732398 is an apocalyptic number.

20781732398 is a deficient number, since it is larger than the sum of its proper divisors (16143415762).

20781732398 is a wasteful number, since it uses less digits than its factorization.

20781732398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98432.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 20781732398 in words is "twenty billion, seven hundred eighty-one million, seven hundred thirty-two thousand, three hundred ninety-eight".