20701789 has 2 divisors, whose sum is σ = 20701790. Its totient is φ = 20701788.

The previous prime is 20701787. The next prime is 20701819. The reversal of 20701789 is 98710702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 6579225 = 3758^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 20701789 - 2¹ = 20701787 is a prime.

Together with 20701787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20701781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350894 + 10350895.

It is an arithmetic number, because the mean of its divisors is an integer number (10350895).

Almost surely, 2^20701789 is an apocalyptic number.

It is an amenable number.

20701789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20701789 is an equidigital number, since it uses as much as digits as its factorization.

20701789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 20701789 is about 4549.9218674610. The cubic root of 20701789 is about 274.5802477823.

The spelling of 20701789 in words is "twenty million, seven hundred one thousand, seven hundred eighty-nine".