20280523 has 2 divisors, whose sum is σ = 20280524. Its totient is φ = 20280522.

The previous prime is 20280509. The next prime is 20280529. The reversal of 20280523 is 32508202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20280523 - 2²¹ = 18183371 is a prime.

It is a super-2 number, since 2×20280523² = 822599226307058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280494 and 20280503.

It is not a weakly prime, because it can be changed into another prime (20280529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140261 + 10140262.

It is an arithmetic number, because the mean of its divisors is an integer number (10140262).

Almost surely, 2^20280523 is an apocalyptic number.

20280523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280523 is an equidigital number, since it uses as much as digits as its factorization.

20280523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20280523 is about 4503.3901674183. The cubic root of 20280523 is about 272.7049682534.

Adding to 20280523 its reverse (32508202), we get a palindrome (52788725).

The spelling of 20280523 in words is "twenty million, two hundred eighty thousand, five hundred twenty-three".