20405713 has 2 divisors, whose sum is σ = 20405714. Its totient is φ = 20405712.

The previous prime is 20405683. The next prime is 20405743. The reversal of 20405713 is 31750402.

It is a balanced prime because it is at equal distance from previous prime (20405683) and next prime (20405743).

It can be written as a sum of positive squares in only one way, i.e., 19421649 + 984064 = 4407^2 + 992^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405713 - 2¹⁷ = 20274641 is a prime.

It is not a weakly prime, because it can be changed into another prime (20405743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202856 + 10202857.

It is an arithmetic number, because the mean of its divisors is an integer number (10202857).

Almost surely, 2^20405713 is an apocalyptic number.

It is an amenable number.

20405713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405713 is an equidigital number, since it uses as much as digits as its factorization.

20405713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20405713 is about 4517.2683117123. The cubic root of 20405713 is about 273.2649460413.

The spelling of 20405713 in words is "twenty million, four hundred five thousand, seven hundred thirteen".