20520097 has 4 divisors (see below), whose sum is σ = 22098580. Its totient is φ = 18941616.

The previous prime is 20520079. The next prime is 20520103. The reversal of 20520097 is 79002502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4004001 + 16516096 = 2001^2 + 4064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20520097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789222 + ... + 789247.

It is an arithmetic number, because the mean of its divisors is an integer number (5524645).

Almost surely, 2^20520097 is an apocalyptic number.

It is an amenable number.

20520097 is a deficient number, since it is larger than the sum of its proper divisors (1578483).

20520097 is a wasteful number, since it uses less digits than its factorization.

20520097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578482.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20520097 is about 4529.9113677863. The cubic root of 20520097 is about 273.7745895081.

Adding to 20520097 its reverse (79002502), we get a palindrome (99522599).

It can be divided in two parts, 205 and 20097, that multiplied together give a triangular number (4119885 = T₂₈₇₀).

The spelling of 20520097 in words is "twenty million, five hundred twenty thousand, ninety-seven".