20713648 has 40 divisors (see below), whose sum is σ = 42975920. Its totient is φ = 9642240.

The previous prime is 20713631. The next prime is 20713657. The reversal of 20713648 is 84631702.

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, 17986 + ... + 19102.

It is an arithmetic number, because the mean of its divisors is an integer number (1074398).

Almost surely, 2^20713648 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 20713648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21487960).

20713648 is an abundant number, since it is smaller than the sum of its proper divisors (22262272).

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

20713648 is a wasteful number, since it uses less digits than its factorization.

20713648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20713648 is about 4551.2248900708. The cubic root of 20713648 is about 274.6326687845.

The spelling of 20713648 in words is "twenty million, seven hundred thirteen thousand, six hundred forty-eight".