20520522 has 48 divisors (see below), whose sum is σ = 49327200. Its totient is φ = 6112800.

The previous prime is 20520517. The next prime is 20520523. The reversal of 20520522 is 22502502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20520495 and 20520504.

It is not an unprimeable number, because it can be changed into a prime (20520523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11229 + ... + 12927.

It is an arithmetic number, because the mean of its divisors is an integer number (1027650).

Almost surely, 2^20520522 is an apocalyptic number.

20520522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20520522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24663600).

20520522 is an abundant number, since it is smaller than the sum of its proper divisors (28806678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20520522 is a wasteful number, since it uses less digits than its factorization.

20520522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1776 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20520522 is about 4529.9582779536. The cubic root of 20520522 is about 273.7764795803.

The spelling of 20520522 in words is "twenty million, five hundred twenty thousand, five hundred twenty-two".