20543479 has 8 divisors (see below), whose sum is σ = 22473360. Its totient is φ = 18624000.

The previous prime is 20543477. The next prime is 20543527. The reversal of 20543479 is 97434502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20543479 - 2¹ = 20543477 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 (20543477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1879 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (2809170).

Almost surely, 2^20543479 is an apocalyptic number.

20543479 is a deficient number, since it is larger than the sum of its proper divisors (1929881).

20543479 is a wasteful number, since it uses less digits than its factorization.

20543479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20543479 is about 4532.4914782049. The cubic root of 20543479 is about 273.8785358587.

The spelling of 20543479 in words is "twenty million, five hundred forty-three thousand, four hundred seventy-nine".