20787542 has 8 divisors (see below), whose sum is σ = 31201632. Its totient is φ = 10387000.

The previous prime is 20787541. The next prime is 20787581. The reversal of 20787542 is 24578702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787541) 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 3 ways as a sum of consecutive naturals, for example, 2492 + ... + 6912.

It is an arithmetic number, because the mean of its divisors is an integer number (3900204).

Almost surely, 2^20787542 is an apocalyptic number.

20787542 is a deficient number, since it is larger than the sum of its proper divisors (10414090).

20787542 is a wasteful number, since it uses less digits than its factorization.

20787542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6774.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 20787542 is about 4559.3356972261. The cubic root of 20787542 is about 274.9588566547.

The spelling of 20787542 in words is "twenty million, seven hundred eighty-seven thousand, five hundred forty-two".