20744542 has 48 divisors (see below), whose sum is σ = 41081040. Its totient is φ = 7765632.

The previous prime is 20744527. The next prime is 20744609. The reversal of 20744542 is 24544702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20744542.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 23778 + ... + 24634.

It is an arithmetic number, because the mean of its divisors is an integer number (855855).

Almost surely, 2^20744542 is an apocalyptic number.

20744542 is a deficient number, since it is larger than the sum of its proper divisors (20336498).

20744542 is a wasteful number, since it uses less digits than its factorization.

20744542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 20744542 is about 4554.6176568401. The cubic root of 20744542 is about 274.7691373744.

The spelling of 20744542 in words is "twenty million, seven hundred forty-four thousand, five hundred forty-two".