20011529 has 2 divisors, whose sum is σ = 20011530. Its totient is φ = 20011528.

The previous prime is 20011507. The next prime is 20011543. The reversal of 20011529 is 92511002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17205904 + 2805625 = 4148^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011529 - 2⁸ = 20011273 is a prime.

It is a super-2 number, since 2×20011529² = 800922585835682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011529.

It is not a weakly prime, because it can be changed into another prime (20011559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005764 + 10005765.

It is an arithmetic number, because the mean of its divisors is an integer number (10005765).

Almost surely, 2^20011529 is an apocalyptic number.

It is an amenable number.

20011529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011529 is an equidigital number, since it uses as much as digits as its factorization.

20011529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 20011529 is about 4473.4247506804. The cubic root of 20011529 is about 271.4939091751.

The spelling of 20011529 in words is "twenty million, eleven thousand, five hundred twenty-nine".