20726688 has 48 divisors (see below), whose sum is σ = 55683936. Its totient is φ = 6746880.

The previous prime is 20726683. The next prime is 20726711. The reversal of 20726688 is 88662702.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (20726681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1618 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (1160082).

Almost surely, 2^20726688 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 20726688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27841968).

20726688 is an abundant number, since it is smaller than the sum of its proper divisors (34957248).

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

20726688 is a wasteful number, since it uses less digits than its factorization.

20726688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077 (or 5069 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 20726688 is about 4552.6572460487. The cubic root of 20726688 is about 274.6902871361.

The spelling of 20726688 in words is "twenty million, seven hundred twenty-six thousand, six hundred eighty-eight".