20467945 has 4 divisors (see below), whose sum is σ = 24561540. Its totient is φ = 16374352.

The previous prime is 20467943. The next prime is 20467961. The reversal of 20467945 is 54976402.

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 7529536 + 12938409 = 2744^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 20467945 - 2¹ = 20467943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20467943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046790 + ... + 2046799.

It is an arithmetic number, because the mean of its divisors is an integer number (6140385).

Almost surely, 2^20467945 is an apocalyptic number.

It is an amenable number.

20467945 is a deficient number, since it is larger than the sum of its proper divisors (4093595).

20467945 is an equidigital number, since it uses as much as digits as its factorization.

20467945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093594.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20467945 is about 4524.1513016255. The cubic root of 20467945 is about 273.5424592653.

It can be divided in two parts, 20467 and 945, that added together give a palindrome (21412).

The spelling of 20467945 in words is "twenty million, four hundred sixty-seven thousand, nine hundred forty-five".