20347743 has 32 divisors (see below), whose sum is σ = 30643200. Its totient is φ = 11926656.

The previous prime is 20347739. The next prime is 20347771. The reversal of 20347743 is 34774302.

It is not a de Polignac number, because 20347743 - 2² = 20347739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20347743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20347783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85018 + ... + 85256.

It is an arithmetic number, because the mean of its divisors is an integer number (957600).

Almost surely, 2^20347743 is an apocalyptic number.

20347743 is a deficient number, since it is larger than the sum of its proper divisors (10295457).

20347743 is a wasteful number, since it uses less digits than its factorization.

20347743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 14112, while the sum is 30.

The square root of 20347743 is about 4510.8472596620. The cubic root of 20347743 is about 273.0059304485.

The spelling of 20347743 in words is "twenty million, three hundred forty-seven thousand, seven hundred forty-three".