20236542 has 8 divisors (see below), whose sum is σ = 40473096. Its totient is φ = 6745512.

The previous prime is 20236537. The next prime is 20236543. The reversal of 20236542 is 24563202.

It is a sphenic number, since it is the product of 3 distinct primes.

20236542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20236543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686373 + ... + 1686384.

It is an arithmetic number, because the mean of its divisors is an integer number (5059137).

Almost surely, 2^20236542 is an apocalyptic number.

20236542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20236542 is a wasteful number, since it uses less digits than its factorization.

20236542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372762.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20236542 is about 4498.5044181372. The cubic root of 20236542 is about 272.5076932991.

Adding to 20236542 its reverse (24563202), we get a palindrome (44799744).

The spelling of 20236542 in words is "twenty million, two hundred thirty-six thousand, five hundred forty-two".