20538726 has 32 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 6211104.

The previous prime is 20538691. The next prime is 20538773. The reversal of 20538726 is 62783502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2371 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^20538726 is an apocalyptic number.

20538726 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20538726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22498560).

20538726 is an abundant number, since it is smaller than the sum of its proper divisors (24458394).

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

20538726 is a wasteful number, since it uses less digits than its factorization.

20538726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20538726 is about 4531.9671225639. The cubic root of 20538726 is about 273.8574124471.

The spelling of 20538726 in words is "twenty million, five hundred thirty-eight thousand, seven hundred twenty-six".