20639448 has 56 divisors (see below), whose sum is σ = 58038300. Its totient is φ = 6877872.

The previous prime is 20639407. The next prime is 20639471. The reversal of 20639448 is 84493602.

It is a happy number.

20639448 is a `hidden beast` number, since 206 + 3 + 9 + 448 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4063 + ... + 7601.

Almost surely, 2^20639448 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 20639448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29019150).

20639448 is an abundant number, since it is smaller than the sum of its proper divisors (37398852).

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

20639448 is an equidigital number, since it uses as much as digits as its factorization.

20639448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563 (or 3544 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20639448 is about 4543.0659251215. The cubic root of 20639448 is about 274.3043486224.

It can be divided in two parts, 2063 and 9448, that added together give a palindrome (11511).

The spelling of 20639448 in words is "twenty million, six hundred thirty-nine thousand, four hundred forty-eight".