20783720093 has 2 divisors, whose sum is σ = 20783720094. Its totient is φ = 20783720092.

The previous prime is 20783719993. The next prime is 20783720101. The reversal of 20783720093 is 39002738702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20614642084 + 169078009 = 143578^2 + 13003^2 .

It is a cyclic number.

It is not a de Polignac number, because 20783720093 - 2⁸ = 20783719837 is a prime.

It is a super-3 number, since 3×20783720093³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20783720093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20783720393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391860046 + 10391860047.

It is an arithmetic number, because the mean of its divisors is an integer number (10391860047).

Almost surely, 2^20783720093 is an apocalyptic number.

It is an amenable number.

20783720093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20783720093 is an equidigital number, since it uses as much as digits as its factorization.

20783720093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 20783720093 in words is "twenty billion, seven hundred eighty-three million, seven hundred twenty thousand, ninety-three".