20930743 has 4 divisors (see below), whose sum is σ = 21095680. Its totient is φ = 20765808.

The previous prime is 20930737. The next prime is 20930801. The reversal of 20930743 is 34703902.

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

It is a cyclic number.

It is not a de Polignac number, because 20930743 - 2⁵ = 20930711 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 (20930243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82278 + ... + 82531.

It is an arithmetic number, because the mean of its divisors is an integer number (5273920).

Almost surely, 2^20930743 is an apocalyptic number.

20930743 is a deficient number, since it is larger than the sum of its proper divisors (164937).

20930743 is a wasteful number, since it uses less digits than its factorization.

20930743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164936.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20930743 is about 4575.0128961567. The cubic root of 20930743 is about 275.5887902583.

The spelling of 20930743 in words is "twenty million, nine hundred thirty thousand, seven hundred forty-three".