20537226 has 40 divisors (see below), whose sum is σ = 46278144. Its totient is φ = 6807240.

The previous prime is 20537219. The next prime is 20537227. The reversal of 20537226 is 62273502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20537226.

It is not an unprimeable number, because it can be changed into a prime (20537227) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 53431 + ... + 53813.

Almost surely, 2^20537226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20537226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23139072).

20537226 is an abundant number, since it is smaller than the sum of its proper divisors (25740918).

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

20537226 is a wasteful number, since it uses less digits than its factorization.

20537226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20537226 is about 4531.8016284917. The cubic root of 20537226 is about 273.8507454299.

The spelling of 20537226 in words is "twenty million, five hundred thirty-seven thousand, two hundred twenty-six".