202105542 has 16 divisors (see below), whose sum is σ = 409328640. Its totient is φ = 66515592.

The previous prime is 202105517. The next prime is 202105543. The reversal of 202105542 is 245501202.

It is a happy number.

It is a super-2 number, since 2×202105542² = 81693300214227528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202105543) 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 7 ways as a sum of consecutive naturals, for example, 212718 + ... + 213665.

It is an arithmetic number, because the mean of its divisors is an integer number (25583040).

Almost surely, 2^202105542 is an apocalyptic number.

202105542 is an abundant number, since it is smaller than the sum of its proper divisors (207223098).

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

202105542 is a wasteful number, since it uses less digits than its factorization.

202105542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426467.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 202105542 is about 14216.3828732909. The cubic root of 202105542 is about 586.8486018174.

Adding to 202105542 its reverse (245501202), we get a palindrome (447606744).

It can be divided in two parts, 20210 and 5542, that added together give a palindrome (25752).

The spelling of 202105542 in words is "two hundred two million, one hundred five thousand, five hundred forty-two".