20901844 has 6 divisors (see below), whose sum is σ = 36578234. Its totient is φ = 10450920.

The previous prime is 20901821. The next prime is 20901863. The reversal of 20901844 is 44810902.

It can be written as a sum of positive squares in only one way, i.e., 20811844 + 90000 = 4562^2 + 300^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2612727 + ... + 2612734.

Almost surely, 2^20901844 is an apocalyptic number.

It is an amenable number.

20901844 is a deficient number, since it is larger than the sum of its proper divisors (15676390).

20901844 is a wasteful number, since it uses less digits than its factorization.

20901844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225465 (or 5225463 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20901844 is about 4571.8534534694. The cubic root of 20901844 is about 275.4618970298.

The spelling of 20901844 in words is "twenty million, nine hundred one thousand, eight hundred forty-four".