20203542 has 12 divisors (see below), whose sum is σ = 43774380. Its totient is φ = 6734508.

The previous prime is 20203523. The next prime is 20203543. The reversal of 20203542 is 24530202.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1122419 = 20203542 / (2 + 0 + 2 + 0 + 3 + 5 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561192 + ... + 561227.

It is an arithmetic number, because the mean of its divisors is an integer number (3647865).

Almost surely, 2^20203542 is an apocalyptic number.

20203542 is an abundant number, since it is smaller than the sum of its proper divisors (23570838).

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

20203542 is a wasteful number, since it uses less digits than its factorization.

20203542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122427 (or 1122424 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20203542 is about 4494.8350359051. The cubic root of 20203542 is about 272.3594853936.

Adding to 20203542 its reverse (24530202), we get a palindrome (44733744).

The spelling of 20203542 in words is "twenty million, two hundred three thousand, five hundred forty-two".