20520255 has 64 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 8633856.

The previous prime is 20520229. The next prime is 20520257. The reversal of 20520255 is 55202502.

It is not a de Polignac number, because 20520255 - 2⁶ = 20520191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69889 + ... + 70181.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^20520255 is an apocalyptic number.

20520255 is a deficient number, since it is larger than the sum of its proper divisors (20122305).

20520255 is a wasteful number, since it uses less digits than its factorization.

20520255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20520255 is about 4529.9288073876. The cubic root of 20520255 is about 273.7752921733.

Adding to 20520255 its reverse (55202502), we get a palindrome (75722757).

The spelling of 20520255 in words is "twenty million, five hundred twenty thousand, two hundred fifty-five".