20520552 has 64 divisors (see below), whose sum is σ = 55944000. Its totient is φ = 6234624.

The previous prime is 20520527. The next prime is 20520553. The reversal of 20520552 is 25502502.

It is not an unprimeable number, because it can be changed into a prime (20520553) 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, 27399 + ... + 28137.

It is an arithmetic number, because the mean of its divisors is an integer number (874125).

Almost surely, 2^20520552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20520552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27972000).

20520552 is an abundant number, since it is smaller than the sum of its proper divisors (35423448).

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

20520552 is a wasteful number, since it uses less digits than its factorization.

20520552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 846 counting only the distinct ones).

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

The square root of 20520552 is about 4529.9615892411. The cubic root of 20520552 is about 273.7766129962.

The spelling of 20520552 in words is "twenty million, five hundred twenty thousand, five hundred fifty-two".