20627945 has 8 divisors (see below), whose sum is σ = 26657736. Its totient is φ = 15232896.

The previous prime is 20627921. The next prime is 20627947. The reversal of 20627945 is 54972602.

It can be written as a sum of positive squares in 4 ways, for example, as 440896 + 20187049 = 664^2 + 4493^2 .

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 20627945 - 2²⁰ = 19579369 is a prime.

It is a super-2 number, since 2×20627945² = 851024229846050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20627947) 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 7 ways as a sum of consecutive naturals, for example, 158612 + ... + 158741.

It is an arithmetic number, because the mean of its divisors is an integer number (3332217).

Almost surely, 2^20627945 is an apocalyptic number.

It is an amenable number.

20627945 is a deficient number, since it is larger than the sum of its proper divisors (6029791).

20627945 is a wasteful number, since it uses less digits than its factorization.

20627945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317371.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20627945 is about 4541.7997534017. The cubic root of 20627945 is about 274.2533797320.

The spelling of 20627945 in words is "twenty million, six hundred twenty-seven thousand, nine hundred forty-five".