20531713 has 2 divisors, whose sum is σ = 20531714. Its totient is φ = 20531712.

The previous prime is 20531701. The next prime is 20531717. The reversal of 20531713 is 31713502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19158129 + 1373584 = 4377^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531713 - 2²¹ = 18434561 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265856 + 10265857.

It is an arithmetic number, because the mean of its divisors is an integer number (10265857).

Almost surely, 2^20531713 is an apocalyptic number.

It is an amenable number.

20531713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531713 is an equidigital number, since it uses as much as digits as its factorization.

20531713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20531713 is about 4531.1933306801. The cubic root of 20531713 is about 273.8262391298.

The spelling of 20531713 in words is "twenty million, five hundred thirty-one thousand, seven hundred thirteen".