20111542 has 8 divisors (see below), whose sum is σ = 32909832. Its totient is φ = 9141600.

The previous prime is 20111501. The next prime is 20111563. The reversal of 20111542 is 24511102.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457059 + ... + 457102.

It is an arithmetic number, because the mean of its divisors is an integer number (4113729).

Almost surely, 2^20111542 is an apocalyptic number.

20111542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20111542 is a deficient number, since it is larger than the sum of its proper divisors (12798290).

20111542 is a wasteful number, since it uses less digits than its factorization.

20111542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914174.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20111542 is about 4484.5893903456. The cubic root of 20111542 is about 271.9454457343.

Adding to 20111542 its reverse (24511102), we get a palindrome (44622644).

It can be divided in two parts, 2011 and 1542, that added together give a palindrome (3553).

The spelling of 20111542 in words is "twenty million, one hundred eleven thousand, five hundred forty-two".