20656532357 has 2 divisors, whose sum is σ = 20656532358. Its totient is φ = 20656532356.

The previous prime is 20656532353. The next prime is 20656532387. The reversal of 20656532357 is 75323565602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16783461601 + 3873070756 = 129551^2 + 62234^2 .

It is a cyclic number.

It is not a de Polignac number, because 20656532357 - 2² = 20656532353 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20656532353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328266178 + 10328266179.

It is an arithmetic number, because the mean of its divisors is an integer number (10328266179).

Almost surely, 2^20656532357 is an apocalyptic number.

It is an amenable number.

20656532357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20656532357 is an equidigital number, since it uses as much as digits as its factorization.

20656532357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134000, while the sum is 44.

The spelling of 20656532357 in words is "twenty billion, six hundred fifty-six million, five hundred thirty-two thousand, three hundred fifty-seven".