20287542 has 32 divisors (see below), whose sum is σ = 44582400. Its totient is φ = 6103520.

The previous prime is 20287493. The next prime is 20287549. The reversal of 20287542 is 24578202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8803 + ... + 10865.

It is an arithmetic number, because the mean of its divisors is an integer number (1393200).

Almost surely, 2^20287542 is an apocalyptic number.

20287542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20287542 is an abundant number, since it is smaller than the sum of its proper divisors (24294858).

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

20287542 is a wasteful number, since it uses less digits than its factorization.

20287542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20287542 is about 4504.1694017876. The cubic root of 20287542 is about 272.7364252888.

The spelling of 20287542 in words is "twenty million, two hundred eighty-seven thousand, five hundred forty-two".