20761705357 has 2 divisors, whose sum is σ = 20761705358. Its totient is φ = 20761705356.

The previous prime is 20761705319. The next prime is 20761705369. The reversal of 20761705357 is 75350716702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20383558441 + 378146916 = 142771^2 + 19446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20761705357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20761705387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10380852678 + 10380852679.

It is an arithmetic number, because the mean of its divisors is an integer number (10380852679).

Almost surely, 2^20761705357 is an apocalyptic number.

It is an amenable number.

20761705357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20761705357 is an equidigital number, since it uses as much as digits as its factorization.

20761705357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 308700, while the sum is 43.

The spelling of 20761705357 in words is "twenty billion, seven hundred sixty-one million, seven hundred five thousand, three hundred fifty-seven".