20893236 has 144 divisors (see below), whose sum is σ = 64520064. Its totient is φ = 5121792.

The previous prime is 20893211. The next prime is 20893237. The reversal of 20893236 is 63239802.

It is a junction number, because it is equal to n+sod(n) for n = 20893197 and 20893206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20893237) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 394186 + ... + 394238.

It is an arithmetic number, because the mean of its divisors is an integer number (448056).

Almost surely, 2^20893236 is an apocalyptic number.

20893236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20893236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32260032).

20893236 is an abundant number, since it is smaller than the sum of its proper divisors (43626828).

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

20893236 is a wasteful number, since it uses less digits than its factorization.

20893236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 20893236 is about 4570.9119440217. The cubic root of 20893236 is about 275.4240773748.

The spelling of 20893236 in words is "twenty million, eight hundred ninety-three thousand, two hundred thirty-six".