20542572 has 120 divisors (see below), whose sum is σ = 58544640. Its totient is φ = 6259680.

The previous prime is 20542559. The next prime is 20542573. The reversal of 20542572 is 27524502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20542573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 289297 + ... + 289367.

It is an arithmetic number, because the mean of its divisors is an integer number (487872).

Almost surely, 2^20542572 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 20542572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29272320).

20542572 is an abundant number, since it is smaller than the sum of its proper divisors (38002068).

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

20542572 is a wasteful number, since it uses less digits than its factorization.

20542572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20542572 is about 4532.3914217552. The cubic root of 20542572 is about 273.8745051963.

The spelling of 20542572 in words is "twenty million, five hundred forty-two thousand, five hundred seventy-two".