20581742 has 4 divisors (see below), whose sum is σ = 30872616. Its totient is φ = 10290870.

The previous prime is 20581721. The next prime is 20581777. The reversal of 20581742 is 24718502.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 5145434 + ... + 5145437.

It is an arithmetic number, because the mean of its divisors is an integer number (7718154).

Almost surely, 2^20581742 is an apocalyptic number.

20581742 is a deficient number, since it is larger than the sum of its proper divisors (10290874).

20581742 is a wasteful number, since it uses less digits than its factorization.

20581742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10290873.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20581742 is about 4536.7104822768. The cubic root of 20581742 is about 274.0484667492.

The spelling of 20581742 in words is "twenty million, five hundred eighty-one thousand, seven hundred forty-two".