20427745 has 16 divisors (see below), whose sum is σ = 27311760. Its totient is φ = 14563584.

The previous prime is 20427707. The next prime is 20427763. The reversal of 20427745 is 54772402.

20427745 = 301² + 302² + ... + 445².

It can be written as a sum of positive squares in 8 ways, for example, as 3196944 + 17230801 = 1788^2 + 4151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20427745 - 2¹¹ = 20425697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3534 + ... + 7303.

It is an arithmetic number, because the mean of its divisors is an integer number (1706985).

Almost surely, 2^20427745 is an apocalyptic number.

It is an amenable number.

20427745 is a deficient number, since it is larger than the sum of its proper divisors (6884015).

20427745 is a wasteful number, since it uses less digits than its factorization.

20427745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 20427745 is about 4519.7062957675. The cubic root of 20427745 is about 273.3632585056.

The spelling of 20427745 in words is "twenty million, four hundred twenty-seven thousand, seven hundred forty-five".