20520026 has 4 divisors (see below), whose sum is σ = 30780042. Its totient is φ = 10260012.

The previous prime is 20519977. The next prime is 20520029. The reversal of 20520026 is 62002502.

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

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 8994001 = 3395^2 + 2999^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20519986 and 20520013.

It is not an unprimeable number, because it can be changed into a prime (20520029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130005 + ... + 5130008.

Almost surely, 2^20520026 is an apocalyptic number.

20520026 is a deficient number, since it is larger than the sum of its proper divisors (10260016).

20520026 is a wasteful number, since it uses less digits than its factorization.

20520026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10260015.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20520026 is about 4529.9035309816. The cubic root of 20520026 is about 273.7742737523.

Adding to 20520026 its reverse (62002502), we get a palindrome (82522528).

The spelling of 20520026 in words is "twenty million, five hundred twenty thousand, twenty-six".