20221993717 has 2 divisors, whose sum is σ = 20221993718. Its totient is φ = 20221993716.

The previous prime is 20221993711. The next prime is 20221993739. The reversal of 20221993717 is 71739912202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18679782276 + 1542211441 = 136674^2 + 39271^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221993717 - 2³ = 20221993709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221993711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110996858 + 10110996859.

It is an arithmetic number, because the mean of its divisors is an integer number (10110996859).

Almost surely, 2^20221993717 is an apocalyptic number.

It is an amenable number.

20221993717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221993717 is an equidigital number, since it uses as much as digits as its factorization.

20221993717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 43.

It can be divided in two parts, 202219 and 93717, that added together give a square (295936 = 544²).

The spelling of 20221993717 in words is "twenty billion, two hundred twenty-one million, nine hundred ninety-three thousand, seven hundred seventeen".