20924543 has 4 divisors (see below), whose sum is σ = 21004368. Its totient is φ = 20844720.

The previous prime is 20924539. The next prime is 20924551. The reversal of 20924543 is 34542902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34542902 = 2 ⋅17271451.

It is a cyclic number.

It is not a de Polignac number, because 20924543 - 2² = 20924539 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 (20924513) 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, 39518 + ... + 40043.

It is an arithmetic number, because the mean of its divisors is an integer number (5251092).

Almost surely, 2^20924543 is an apocalyptic number.

20924543 is a deficient number, since it is larger than the sum of its proper divisors (79825).

20924543 is an equidigital number, since it uses as much as digits as its factorization.

20924543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79824.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20924543 is about 4574.3352522525. The cubic root of 20924543 is about 275.5615763934.

The spelling of 20924543 in words is "twenty million, nine hundred twenty-four thousand, five hundred forty-three".