20858731529 has 2 divisors, whose sum is σ = 20858731530. Its totient is φ = 20858731528.

The previous prime is 20858731489. The next prime is 20858731547. The reversal of 20858731529 is 92513785802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20776339600 + 82391929 = 144140^2 + 9077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20858731529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20858731129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429365764 + 10429365765.

It is an arithmetic number, because the mean of its divisors is an integer number (10429365765).

Almost surely, 2^20858731529 is an apocalyptic number.

It is an amenable number.

20858731529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858731529 is an equidigital number, since it uses as much as digits as its factorization.

20858731529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 20858731529 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-one thousand, five hundred twenty-nine".