20705831501 has 2 divisors, whose sum is σ = 20705831502. Its totient is φ = 20705831500.

The previous prime is 20705831491. The next prime is 20705831537. The reversal of 20705831501 is 10513850702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14520009001 + 6185822500 = 120499^2 + 78650^2 .

It is a cyclic number.

It is not a de Polignac number, because 20705831501 - 2⁶ = 20705831437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20705831561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352915750 + 10352915751.

It is an arithmetic number, because the mean of its divisors is an integer number (10352915751).

Almost surely, 2^20705831501 is an apocalyptic number.

It is an amenable number.

20705831501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705831501 is an equidigital number, since it uses as much as digits as its factorization.

20705831501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 20705831501 in words is "twenty billion, seven hundred five million, eight hundred thirty-one thousand, five hundred one".