20939044 has 48 divisors (see below), whose sum is σ = 43908480. Its totient is φ = 8547840.

The previous prime is 20939033. The next prime is 20939057. The reversal of 20939044 is 44093902.

20939044 = 78² + 79² + ... + 398².

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 20938997 and 20939015.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 86764 + ... + 87004.

It is an arithmetic number, because the mean of its divisors is an integer number (914760).

Almost surely, 2^20939044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20939044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21954240).

20939044 is an abundant number, since it is smaller than the sum of its proper divisors (22969436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20939044 is a wasteful number, since it uses less digits than its factorization.

20939044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20939044 is about 4575.9200167835. The cubic root of 20939044 is about 275.6252176989.

The spelling of 20939044 in words is "twenty million, nine hundred thirty-nine thousand, forty-four".