20727473 has 4 divisors (see below), whose sum is σ = 22321908. Its totient is φ = 19133040.

The previous prime is 20727457. The next prime is 20727491. The reversal of 20727473 is 37472702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 12271009 = 2908^2 + 3503^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727473 - 2⁴ = 20727457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20727433) 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, 797198 + ... + 797223.

It is an arithmetic number, because the mean of its divisors is an integer number (5580477).

Almost surely, 2^20727473 is an apocalyptic number.

It is an amenable number.

20727473 is a deficient number, since it is larger than the sum of its proper divisors (1594435).

20727473 is a wasteful number, since it uses less digits than its factorization.

20727473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594434.

The product of its (nonzero) digits is 16464, while the sum is 32.

The square root of 20727473 is about 4552.7434586192. The cubic root of 20727473 is about 274.6937549543.

The spelling of 20727473 in words is "twenty million, seven hundred twenty-seven thousand, four hundred seventy-three".