20478844 has 24 divisors (see below), whose sum is σ = 36959328. Its totient is φ = 9922560.

The previous prime is 20478823. The next prime is 20478869. The reversal of 20478844 is 44887402.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31329 + ... + 31975.

It is an arithmetic number, because the mean of its divisors is an integer number (1539972).

Almost surely, 2^20478844 is an apocalyptic number.

It is an amenable number.

20478844 is a deficient number, since it is larger than the sum of its proper divisors (16480484).

20478844 is a wasteful number, since it uses less digits than its factorization.

20478844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 37.

The square root of 20478844 is about 4525.3556766292. The cubic root of 20478844 is about 273.5910036313.

It can be divided in two parts, 20 and 478844, that added together give a square (478864 = 692²).

The spelling of 20478844 in words is "twenty million, four hundred seventy-eight thousand, eight hundred forty-four".