20754643 has 16 divisors (see below), whose sum is σ = 25876480. Its totient is φ = 16207776.

The previous prime is 20754623. The next prime is 20754653. The reversal of 20754643 is 34645702.

It is not a de Polignac number, because 20754643 - 2⁵ = 20754611 is a prime.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (20754623) 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 15 ways as a sum of consecutive naturals, for example, 5746 + ... + 8632.

It is an arithmetic number, because the mean of its divisors is an integer number (1617280).

Almost surely, 2^20754643 is an apocalyptic number.

20754643 is a deficient number, since it is larger than the sum of its proper divisors (5121837).

20754643 is a wasteful number, since it uses less digits than its factorization.

20754643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20754643 is about 4555.7263965256. The cubic root of 20754643 is about 274.8137272992.

The spelling of 20754643 in words is "twenty million, seven hundred fifty-four thousand, six hundred forty-three".