20218743 has 6 divisors (see below), whose sum is σ = 29204864. Its totient is φ = 13479156.

The previous prime is 20218721. The next prime is 20218787. The reversal of 20218743 is 34781202.

It is not a de Polignac number, because 20218743 - 2⁵ = 20218711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218703) 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 5 ways as a sum of consecutive naturals, for example, 1123255 + ... + 1123272.

Almost surely, 2^20218743 is an apocalyptic number.

20218743 is a deficient number, since it is larger than the sum of its proper divisors (8986121).

20218743 is a wasteful number, since it uses less digits than its factorization.

20218743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246533 (or 2246530 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20218743 is about 4496.5256587726. The cubic root of 20218743 is about 272.4277753768.

Adding to 20218743 its reverse (34781202), we get a palindrome (54999945).

The spelling of 20218743 in words is "twenty million, two hundred eighteen thousand, seven hundred forty-three".