20528623 has 2 divisors, whose sum is σ = 20528624. Its totient is φ = 20528622.

The previous prime is 20528593. The next prime is 20528647. The reversal of 20528623 is 32682502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20528623 - 2⁵ = 20528591 is a prime.

It is a super-2 number, since 2×20528623² = 842848724552258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20528591 and 20528600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20528653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10264311 + 10264312.

It is an arithmetic number, because the mean of its divisors is an integer number (10264312).

Almost surely, 2^20528623 is an apocalyptic number.

20528623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20528623 is an equidigital number, since it uses as much as digits as its factorization.

20528623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20528623 is about 4530.8523480687. The cubic root of 20528623 is about 273.8125015924.

The spelling of 20528623 in words is "twenty million, five hundred twenty-eight thousand, six hundred twenty-three".