20944505 has 4 divisors (see below), whose sum is σ = 25133412. Its totient is φ = 16755600.

The previous prime is 20944489. The next prime is 20944541. The reversal of 20944505 is 50544902.

It is a happy number.

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 12759184 + 8185321 = 3572^2 + 2861^2 .

It is not a de Polignac number, because 20944505 - 2⁴ = 20944489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2094446 + ... + 2094455.

It is an arithmetic number, because the mean of its divisors is an integer number (6283353).

Almost surely, 2^20944505 is an apocalyptic number.

It is an amenable number.

20944505 is a deficient number, since it is larger than the sum of its proper divisors (4188907).

20944505 is an equidigital number, since it uses as much as digits as its factorization.

20944505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188906.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20944505 is about 4576.5166884870. The cubic root of 20944505 is about 275.6491770621.

The spelling of 20944505 in words is "twenty million, nine hundred forty-four thousand, five hundred five".