20709488 has 40 divisors (see below), whose sum is σ = 42425856. Its totient is φ = 9777600.

The previous prime is 20709473. The next prime is 20709497. The reversal of 20709488 is 88490702.

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, 20843 + ... + 21813.

Almost surely, 2^20709488 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 20709488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21212928).

20709488 is an abundant number, since it is smaller than the sum of its proper divisors (21716368).

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

20709488 is a wasteful number, since it uses less digits than its factorization.

20709488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20709488 is about 4550.7678472979. The cubic root of 20709488 is about 274.6142823822.

The spelling of 20709488 in words is "twenty million, seven hundred nine thousand, four hundred eighty-eight".