20280529 has 2 divisors, whose sum is σ = 20280530. Its totient is φ = 20280528.

The previous prime is 20280523. The next prime is 20280569. The reversal of 20280529 is 92508202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 2235025 = 4248^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20280529 - 2⁷ = 20280401 is a prime.

It is a super-2 number, since 2×20280529² = 822599713039682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20280497 and 20280506.

It is not a weakly prime, because it can be changed into another prime (20280523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140264 + 10140265.

It is an arithmetic number, because the mean of its divisors is an integer number (10140265).

Almost surely, 2^20280529 is an apocalyptic number.

It is an amenable number.

20280529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280529 is an equidigital number, since it uses as much as digits as its factorization.

20280529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20280529 is about 4503.3908335831. The cubic root of 20280529 is about 272.7049951466.

The spelling of 20280529 in words is "twenty million, two hundred eighty thousand, five hundred twenty-nine".