20781732203 has 2 divisors, whose sum is σ = 20781732204. Its totient is φ = 20781732202.

The previous prime is 20781732193. The next prime is 20781732221. The reversal of 20781732203 is 30223718702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20781732203 - 2²⁶ = 20714623339 is a prime.

It is not a weakly prime, because it can be changed into another prime (20781732233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390866101 + 10390866102.

It is an arithmetic number, because the mean of its divisors is an integer number (10390866102).

Almost surely, 2^20781732203 is an apocalyptic number.

20781732203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20781732203 is an equidigital number, since it uses as much as digits as its factorization.

20781732203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 20781732203 in words is "twenty billion, seven hundred eighty-one million, seven hundred thirty-two thousand, two hundred three".