20520213 has 16 divisors (see below), whose sum is σ = 32032896. Its totient is φ = 11439360.

The previous prime is 20520211. The next prime is 20520221. The reversal of 20520213 is 31202502.

It is not a de Polignac number, because 20520213 - 2¹ = 20520211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20520192 and 20520201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11056 + ... + 12777.

It is an arithmetic number, because the mean of its divisors is an integer number (2002056).

Almost surely, 2^20520213 is an apocalyptic number.

It is an amenable number.

20520213 is a deficient number, since it is larger than the sum of its proper divisors (11512683).

20520213 is a wasteful number, since it uses less digits than its factorization.

20520213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23884.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20520213 is about 4529.9241715508. The cubic root of 20520213 is about 273.7751053892.

Adding to 20520213 its reverse (31202502), we get a palindrome (51722715).

The spelling of 20520213 in words is "twenty million, five hundred twenty thousand, two hundred thirteen".